阅读说明：本技术 光学薄膜及显示器件 (Optical film and display device ) 是由 王和金 汪炳伟 王纯阳 于 2021-07-26 设计创作，主要内容包括：本发明提供一种光学薄膜及显示器件,其中,光学薄膜用于设置在显示器件中的多个发光元件的出光侧,其包括滤光膜层和半透光膜层,滤光膜层和半透光膜层中的一个设置在另一个远离多个发光元件的一侧,滤光膜层用于使多个发光元件发出的至少部分波长的光透过,并将自外界照射向多个发光元件的自然光中,除滤光膜层能够透过的至少部分波长之外的波长的光进行吸收；半透光膜层用于将自外界照射向相邻的两个发光元件之间的间隙的自然光的部分进行吸收,并使自然光的部分透过。本发明提供的光学薄膜及显示器件能够降低有机电致发光元件反射的光,提高显示对比度,并提升柔性屏幕反复折叠的能力,且兼容屏下光学传感功能、兼容屏下指纹识别功能。(The invention provides an optical film and a display device, wherein the optical film is used for the light-emitting sides of a plurality of light-emitting elements in the display device and comprises a light-filtering film layer and a semi-light-transmitting film layer, one of the light-filtering film layer and the semi-light-transmitting film layer is arranged on one side of the other side far away from the plurality of light-emitting elements, the light-filtering film layer is used for enabling at least part of wavelengths of light emitted by the plurality of light-emitting elements to transmit and absorbing at least part of wavelengths of light which can transmit in natural light irradiated to the plurality of light-emitting elements from the outside; the semi-light-transmitting film layer absorbs a portion of natural light irradiated from the outside to a gap between two adjacent light-emitting elements, and transmits the portion of the natural light. The optical film and the display device provided by the invention can reduce light reflected by the organic electroluminescent element, improve the display contrast, improve the capability of repeatedly folding the flexible screen, and are compatible with the optical sensing function under the screen and the fingerprint identification function under the screen.)

1. An optical film for being disposed on a light exit side of a plurality of light emitting elements in a display device, the optical film comprising a filter film layer and a semi-transmissive film layer, one of the filter film layer and the semi-transmissive film layer being disposed on a side of the other remote from the plurality of light emitting elements, wherein the filter film layer is configured to transmit at least part of wavelengths of light emitted from the plurality of light emitting elements and absorb, of natural light irradiated from the outside to the plurality of light emitting elements, wavelengths of light other than the at least part of wavelengths that the filter film layer can transmit;

the semi-light-transmitting film layer is used for absorbing the natural light irradiated to the gap between the two adjacent light-emitting elements from the outside and transmitting the natural light.

2. The optical film according to claim 1, wherein the semi-transparent film layer comprises a plurality of semi-transparent units, the plurality of semi-transparent units are arranged at intervals, the direction of the arrangement of the plurality of semi-transparent units is parallel to the direction of the arrangement of the plurality of light-emitting elements, the plurality of semi-transparent units are arranged in one-to-one correspondence with the gaps between two adjacent light-emitting elements, and each semi-transparent unit can absorb part of the light irradiated thereon and transmit part of the light irradiated thereon.

3. An optical film according to claim 2, wherein the semi-light-transmitting unit includes a semi-light-transmitting metal film.

4. The optical film according to claim 3, wherein the semi-transparent film layer further comprises a first dielectric layer, and the first dielectric layer is disposed on a side of the plurality of semi-transparent units away from the plurality of light-emitting elements and in a gap between two adjacent semi-transparent units.

5. The optical film according to claim 3 or 4, wherein the semi-transparent film layer further comprises a second dielectric layer, and the second dielectric layer is disposed on a side of the plurality of semi-transparent units close to the plurality of light-emitting elements and covers a gap between two adjacent semi-transparent units.

6. The optical film according to claim 4, wherein the semi-transparent film layer comprises a plurality of semi-transparent unit groups and a plurality of first medium layers, each semi-transparent unit group comprises a plurality of semi-transparent units, the plurality of first medium layers are arranged in a one-to-one correspondence with the plurality of semi-transparent unit groups, the plurality of semi-transparent unit groups are sequentially arranged along a direction away from the plurality of light emitting elements, the plurality of semi-transparent units in each semi-transparent unit group are arranged at intervals, and the direction of the interval arrangement of the plurality of semi-transparent units in each semi-transparent unit group is parallel to the direction of the interval arrangement of the plurality of light emitting elements and is used for being arranged in a one-to-one correspondence with gaps between two adjacent light emitting elements.

7. The optical film according to claim 1, wherein the filter film layer comprises a plurality of filter units, the filter units are arranged at intervals, the direction of the filter units is parallel to the direction of the light-emitting elements, the filter units are arranged in one-to-one correspondence with the light-emitting elements, the light-emitting elements corresponding to the filter units can emit light that can be transmitted by the filter units, and each filter unit can absorb light with wavelengths other than the part of wavelengths that can be transmitted by the filter unit.

8. The optical film according to claim 7, wherein the filter film layer further comprises a flat protective layer disposed on a side of the plurality of filter units remote from the plurality of light emitting elements and in a gap between two adjacent filter units.

9. The optical film of claim 8, wherein the filter film layer further comprises a third dielectric layer disposed on a side of the flat protective layer away from the plurality of light-emitting elements and covering the flat protective layer, and a refractive index of the third dielectric layer is between a refractive index of the flat protective layer and a refractive index of a dielectric on a side of the flat protective layer away from the plurality of light-emitting elements with respect to the third dielectric layer.

10. A display device comprising a light emitting element and the optical film according to any one of claims 1 to 9, the optical film being provided on a light exit side of the light emitting element.

Technical Field

The invention relates to the technical field of display, in particular to an optical film and a display device.

Background

An Organic electroluminescent Display (OLED) emits Light by using an Organic Light-Emitting Diode (OLED) fabricated on a substrate. When external natural light penetrates into the organic electroluminescent display and penetrates through the packaging layer of the organic electroluminescent element to irradiate the organic electroluminescent element, the external natural light is reflected, namely, the organic electroluminescent element emits the external natural light irradiated on the organic electroluminescent element back, so that the contrast of the organic electroluminescent display is poor, and the display effect is poor.

Therefore, in order to improve the contrast of the organic electroluminescent display and improve the display effect, an optical structure is usually disposed on the organic electroluminescent device to reduce the light reflected by the organic electroluminescent device, but some optical structures are usually thicker and are not conducive to repeated folding of the flexible screen, and other optical structures can block light, so that the light cannot enter the organic electroluminescent display, and the organic electroluminescent display using these optical structures cannot be compatible with the optical sensing function under the screen, and cannot be compatible with the fingerprint recognition function under the screen.

Disclosure of Invention

The invention aims to at least solve one of the technical problems in the prior art, and provides an optical film and a display device, which can reduce light reflected by an organic electroluminescent element, improve display contrast, improve the capability of repeatedly folding a flexible screen, and are compatible with an optical sensing function under the screen and an fingerprint identification function under the screen.

In order to achieve the above object, the present invention provides an optical film for light exit sides of a plurality of light emitting elements provided in a display device, the optical film including a filter film layer and a semi-transmissive film layer, one of the filter film layer and the semi-transmissive film layer being provided on the other side away from the plurality of light emitting elements, wherein the filter film layer is configured to transmit at least part of wavelengths of light emitted from the plurality of light emitting elements and absorb at least part of wavelengths of light other than the wavelengths which the filter film layer can transmit, among natural light irradiated from the outside to the plurality of light emitting elements;

the semi-light-transmitting film layer is used for absorbing the natural light irradiated to the gap between the two adjacent light-emitting elements from the outside and transmitting the natural light.

Optionally, the semi-transparent film layer includes a plurality of semi-transparent units, the plurality of semi-transparent units are arranged at intervals, a direction of the plurality of semi-transparent units is parallel to a direction of the plurality of light emitting elements, the plurality of semi-transparent units are arranged in one-to-one correspondence with a gap between two adjacent light emitting elements, and each semi-transparent unit can absorb a part of light irradiated thereon and make the part of light irradiated thereon penetrate therethrough.

Optionally, the semi-light-transmitting unit includes a semi-light-transmitting metal film.

Optionally, the semi-transparent film layer further includes a first dielectric layer, and the first dielectric layer is disposed on one side of the plurality of semi-transparent units away from the plurality of light emitting elements, and is disposed in a gap between two adjacent semi-transparent units.

Optionally, the semi-transparent film layer further includes a second dielectric layer, and the second dielectric layer is disposed on one side of the plurality of semi-transparent units close to the plurality of light emitting elements, and covers a gap between two adjacent semi-transparent units.

Optionally, the semi-transparent film layer includes a plurality of semi-transparent unit groups and a plurality of first medium layers, each semi-transparent unit group includes a plurality of semi-transparent units, the plurality of first medium layers are arranged in a one-to-one correspondence with the plurality of semi-transparent unit groups, the plurality of semi-transparent unit groups are sequentially arranged along a direction away from the plurality of light emitting elements, the plurality of semi-transparent units in each semi-transparent unit group are arranged at intervals, and the direction of the plurality of semi-transparent units in each semi-transparent unit group is parallel to the direction of the plurality of light emitting elements, and is used for being arranged in a one-to-one correspondence with a gap between two adjacent light emitting elements.

Optionally, the filtering film layer includes a plurality of filtering units, a plurality of the filtering units are arranged at intervals, and a plurality of the filtering units are arranged at intervals and parallel to the direction of the light emitting elements, the filtering units are arranged in one-to-one correspondence with the light emitting elements, and each of the filtering units corresponds to the light emitting element capable of emitting light that can be transmitted by the filtering unit, and each of the filtering units can absorb light with wavelengths other than the partial wavelengths that can be transmitted by the filtering unit.

Optionally, the filter film layer further includes a flat protective layer, and the flat protective layer is disposed on one side of the plurality of filter units away from the plurality of light emitting elements, and is disposed in a gap between two adjacent filter units.

Optionally, the filter film layer further includes a third dielectric layer, the third dielectric layer is disposed on a side of the flat protective layer away from the plurality of light emitting elements and covers the flat protective layer, and a refractive index of the third dielectric layer is between a refractive index of the flat protective layer and a refractive index of a dielectric opposite to the side of the third dielectric layer away from the plurality of light emitting elements.

The invention also provides a display device comprising a light-emitting component and the optical film provided by the invention, wherein the optical film is arranged on the light-emitting side of the light-emitting component.

The invention has the following beneficial effects:

the optical film provided by the invention can transmit at least part of the light with wavelength emitted by a plurality of light-emitting elements by the filter film layer so as to enable a display device to normally display an image, absorb at least part of the light with wavelength except for the light with wavelength which can be transmitted by the filter film layer in the natural light irradiated to the plurality of light-emitting elements from the outside by the filter film layer, absorb part of the natural light irradiated to the gap between two adjacent light-emitting elements from the outside by the semi-transparent film layer, and transmit part of the natural light so as to reduce the light which can be irradiated to the plurality of light-emitting elements by the natural light on one hand, thereby reducing the light reflected by the light-emitting elements (such as organic electroluminescent elements) and improving the display contrast, and transmit part of the natural light on the other hand, thereby being compatible with an optical sensing function under a screen and an fingerprint identification function under the screen, in addition, because the light filtering film layer and the semi-light transmitting film layer of the optical film are both films prepared by a semiconductor process, the thickness of the optical film is smaller, and the repeated folding capacity of the flexible screen can be improved.

According to the display device provided by the invention, the optical film provided by the invention is arranged on the light emergent side of the light emitting component, so that the light reflected by the organic electroluminescent element can be reduced, the display contrast is improved, the capability of repeatedly folding the flexible screen is improved, and the display device is compatible with the optical sensing function under the screen and the fingerprint identification function under the screen.

Drawings

Fig. 1 is a schematic structural diagram of an optical film and a display device according to an embodiment of the present invention, in which a semi-transmissive film layer is disposed on a side of a filter layer away from a plurality of light emitting elements;

fig. 2 is a schematic structural diagram of an optical film and a display device in which a filter layer is disposed on a semi-transparent layer away from a plurality of light-emitting elements according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the optical film and display device of FIG. 1 with a transparent protective layer;

FIG. 4 is a schematic diagram of the optical film and display device of FIG. 2 with a transparent protective layer;

FIG. 5 is a schematic top view of the optical film and display device of FIGS. 1-4;

FIG. 6 is a graph illustrating transmittance and reflectance of an optical film and a display device according to embodiments of the present invention;

description of reference numerals:

1-an optical film; 11-a light filtering film layer; 111-a light filtering unit; 112-a flat protective layer; 113-a third dielectric layer; 12-a semi-transparent film layer; 121-a semi-transmissive unit; 122-a first dielectric layer; 123-a second dielectric layer; 13-a transparent protective layer; 2-a light emitting component; 21-a substrate; 22-drive array backplane; 23-a light emitting element; 24-thin film packaging; 25-buffer layer.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the optical film and the display device provided by the present invention is provided with reference to the accompanying drawings.

In order to make those skilled in the art better understand the optical film and the display device provided by the embodiments of the present invention, a description will be first given of a method of reducing reflection of a light emitting element using a circular polarizer and a method of using a black matrix. The circular polarizer is formed by gluing the linear polarizer and the quarter-wave plate, so that the circular polarizer needs not only substrates of the linear polarizer and the quarter-wave plate, but also an adhesive for gluing the linear polarizer and the quarter-wave plate, so that the thickness of the circular polarizer is larger, and the repeated folding of the flexible screen is not facilitated. The black matrix is adopted to reduce the reflection of the light-emitting element, the black matrix is correspondingly arranged with a gap between two adjacent light-emitting elements, and the black matrix is lightproof, namely, the light cannot penetrate through the black matrix, therefore, the natural light irradiated from the outside to the inside of the display device cannot penetrate through the black matrix, so that the display device adopting the black matrix to reduce the reflection of the light-emitting element cannot be compatible with the optical sensing function under the screen.

As shown in fig. 1 and fig. 3, an embodiment of the present invention provides an optical film 1, where the optical film 1 is configured to be disposed on a light-emitting side of a plurality of light-emitting elements 23 in a display device, the optical film 1 includes a filter film layer 11 and a semi-light-transmitting film layer 12, and one of the filter film layer 11 and the semi-light-transmitting film layer 12 is disposed on the other side away from the plurality of light-emitting elements 23, where the filter film layer 11 is configured to transmit at least part of wavelengths of light emitted by the plurality of light-emitting elements 23, and absorb at least part of wavelengths of light other than the at least part of wavelengths that the filter film layer 11 can transmit, of natural light irradiated from the outside to the plurality of light-emitting elements 23; the semi-light-transmitting film layer 12 absorbs a portion of natural light irradiated from the outside into a gap between two adjacent light-emitting elements 23, and transmits the portion of natural light.

In the optical film 1 according to the embodiment of the present invention, light having at least a part of wavelengths emitted from the plurality of light emitting elements 23 is transmitted through the filter layer 11 so that the display device can normally display an image, and of natural light emitted from the outside to the plurality of light emitting elements 23, light having wavelengths other than at least a part of the wavelengths that the filter layer 11 can transmit is absorbed through the filter layer 11, and a part of the natural light emitted from the outside to the gap between two adjacent light emitting elements 23 is absorbed through the semi-transmissive layer 12 so that the natural light can be transmitted through the semi-transmissive layer, so that the light that the natural light can be emitted to the plurality of light emitting elements 23 can be reduced, the light reflected by the light emitting elements 23 (for example, the organic electroluminescence elements 23) can be reduced, the display contrast can be improved, and the natural light can be partially transmitted through the semi-transmissive, so that the optical sensing function under the screen can be compatible with the display device, The fingerprint identification function under the screen is compatible, and the optical filtering film layer 11 and the semi-transparent film layer 12 of the optical film 1 are both films prepared by a semiconductor process, so that the thickness of the optical film 1 is small, and the repeated folding capability of the flexible screen can be improved.

Specifically, the semi-transmissive film layer 12 may be disposed on a side of the filter layer 11 away from the plurality of light emitting elements 23 (as shown in fig. 1), or the filter layer 11 may be disposed on a side of the semi-transmissive film layer 12 away from the plurality of light emitting elements 23 (as shown in fig. 3). The filter layer 11 transmits at least part of the light with the wavelengths emitted by the light emitting elements 23, that is, at least part of the light with the wavelengths emitted by the light emitting elements 23 can be emitted through the filter layer 11, so that the display device can normally display images. The filter film layer 11 absorbs light of wavelengths other than at least part of the wavelengths that can be transmitted through the filter film layer 11 among natural light irradiated from the outside to the plurality of light emitting elements 23, that is, light of at least part of the wavelengths in the natural light can be irradiated onto the light emitting elements 23 through the filter film layer 11, and the wavelengths of the light irradiated onto the light emitting elements 23 through the filter film layer 11 and the wavelengths of the light emitted from the light emitting elements 23 through the filter film layer 11 belong to the same wavelength, while light of the natural light other than the part of the wavelengths can be irradiated onto the light emitting elements 23 through the filter film layer 11, and the light of the rest of the wavelengths is absorbed by the filter film layer 11 and cannot be irradiated onto the light emitting elements 23, so that the light irradiated onto the light emitting elements 23 through the filter film layer 11 is reduced, and the light reflected by the light emitting elements 23 can be reduced, and the wavelengths of the light irradiated onto the light emitting elements 23 through the filter film layer 11 and the light emitted from the light emitting elements 23 can be transmitted through the light emitting elements 23 Since the wavelengths of the light emitted from the filter layer 11 are the same, even if the light applied to the light-emitting element 23 is reflected, the display contrast is less affected, and the display contrast is improved.

The semi-light-transmitting film layer 12 absorbs a part of the natural light irradiated from the outside to the gap between the two adjacent light-emitting elements 23, and allows a part of the natural light to pass through, that is, the part of the natural light can pass through the semi-light-transmitting film layer 12 and irradiate to the gap between the two adjacent light-emitting elements 23, and a part of the natural light is absorbed by the semi-light-transmitting film layer 12 and cannot irradiate to the gap between the two adjacent light-emitting elements 23, so that the light irradiated to the light-emitting elements 23 by the natural light is reduced, and the light reflected by the light-emitting elements 23 can be reduced. Moreover, both the filter film layer 11 and the semi-transparent film layer 12 can enable part of natural light to penetrate and irradiate into the display device, so that the optical film 1 provided by the embodiment of the invention can be compatible with the optical sensing function under the screen, and when the optical sensor under the screen needs to collect a fingerprint, light reflected by the fingerprint can penetrate through the filter film layer 11 and the semi-transparent film layer 12, that is, the light can penetrate through the optical film 1 provided by the embodiment of the invention and enter into the display device, so that the optical sensor under the screen can collect a complete fingerprint, and the optical film 1 provided by the embodiment of the invention can be compatible with the fingerprint identification function under the screen.

As shown in fig. 1 and 3, in a preferred embodiment of the present invention, the semi-transparent film 12 may include a plurality of semi-transparent units 121, the plurality of semi-transparent units 121 are arranged at intervals, a direction of the plurality of semi-transparent units 121 is parallel to a direction of the plurality of light emitting elements 23, the plurality of semi-transparent units 121 are arranged in one-to-one correspondence with a gap between two adjacent light emitting elements 23, and each semi-transparent unit 121 is capable of absorbing a portion of light irradiated thereon and transmitting a portion of light irradiated thereon.

That is, on the light emitting side of the light emitting elements 23, the semi-light transmitting unit 121 is disposed at a position corresponding to the gap between the two adjacent light emitting elements 23, and one semi-light transmitting unit 121 is disposed at a position corresponding to the gap between the two adjacent light emitting elements 23 in the direction parallel to the direction in which the light emitting elements 23 are arranged at intervals, and each semi-light transmitting unit 121 can absorb part of the light irradiated thereto and transmit part of the light irradiated thereto, so that the plurality of semi-light transmitting units 121 can absorb part of the natural light irradiated from the outside to the gap between the two adjacent light emitting elements 23 and transmit part of the natural light, so that the part of the natural light can be irradiated to the gap between the two adjacent light emitting elements 23 through the plurality of semi-light transmitting units 121 and part of the natural light can be absorbed by the plurality of semi-light transmitting units 121, the light cannot be applied to the gap between the adjacent two light emitting elements 23.

In a preferred embodiment of the present invention, the semi-transmissive unit 121 may include a semi-transmissive metal film.

Alternatively, the material of the semi-light-transmitting metal film may include titanium (Ti), molybdenum (Mo), copper (Cu), aluminum (Al), or silver (Ag).

Alternatively, the semi-transparent metal film may have a thickness of 10 angstroms-250 angstroms.

As shown in fig. 1 and 3, in a preferred embodiment of the present invention, the semi-transparent film layer 12 may further include a first dielectric layer 122, where the first dielectric layer 122 is disposed on a side of the plurality of semi-transparent units 121 far away from the plurality of light emitting elements 23, and is disposed in a gap between two adjacent semi-transparent units 121.

When the semi-transmissive unit 121 is a semi-transmissive metal film, by disposing the first dielectric layer 122 on the side of the semi-transmissive units 121 far away from the light-emitting elements 23 and in the gap between two adjacent semi-transmissive units 121, light can be incident on the first dielectric layer 122 from the medium (for example, air) on the side of the semi-transmissive unit 121 far away from the light-emitting elements 23, and then incident on the semi-transmissive unit 121 from the first dielectric layer 122, which can reduce the reflection of the optical film 1 compared with the case where light is directly incident on the semi-transmissive unit 121 from the medium on the side of the first dielectric layer 122 far away from the light-emitting elements 23, thereby further improving the display contrast.

Alternatively, the material of the first dielectric layer 122 may include silicon dioxide (SiO)₂)。

Optionally, the thickness of the first dielectric layer 122 may be 800 angstroms.

As shown in fig. 1 and 3, in a preferred embodiment of the present invention, the semi-transparent film layer 12 may further include a second medium layer 123, and the second medium layer 123 is disposed on a side of the plurality of semi-transparent units 121 close to the plurality of light emitting elements 23 and covers a gap between two adjacent semi-transparent units 121.

When the semi-transparent units 121 are semi-transparent metal films, the second dielectric layer 123 is disposed on one side of the semi-transparent units 121 close to the light-emitting elements 23, and the second dielectric layer 123 covers a gap between two adjacent semi-transparent units 121, so that light can be incident on the second dielectric layer 123 through the semi-transparent units 121 first, and then incident on the medium close to one side of the light-emitting elements 23 relative to the second dielectric layer 123 through the second dielectric layer 123, which can reduce reflection of the optical film 1 compared with the case where light is directly incident on the medium close to one side of the light-emitting elements 23 relative to the second dielectric layer 123 through the semi-transparent units 121, thereby further improving display contrast.

Alternatively, the refractive index of the second dielectric layer 123 may be greater than or equal to the refractive index of the first dielectric layer 122.

Alternatively, the material of the second dielectric layer 123 may include silicon dioxide (SiO)₂)。

Optionally, the thickness of the second dielectric layer 123 may be 800 angstroms.

As shown in fig. 1 and fig. 3, in a preferred embodiment of the present invention, the semi-transparent film layer 12 may include a plurality of semi-transparent units 121 and a plurality of first dielectric layers 122, each semi-transparent unit 121 includes a plurality of semi-transparent units 121, the plurality of first dielectric layers 122 are disposed in one-to-one correspondence with the plurality of semi-transparent units 121, the plurality of semi-transparent units 121 are sequentially disposed along a direction away from the plurality of light emitting elements 23, the plurality of semi-transparent units 121 in each semi-transparent unit 121 are arranged at intervals, and the direction of the plurality of semi-transparent units 121 in each semi-transparent unit 121 is parallel to the direction of the plurality of light emitting elements 23, and is configured to be disposed in one-to-one correspondence with the gaps between two adjacent light emitting elements 23.

That is, the plurality of semi-light transmitting units 121 arranged at intervals in a direction parallel to the direction in which the plurality of light emitting elements 23 are arranged at intervals form one semi-light transmitting unit 121 group, and the plurality of semi-light transmitting units 121 in the one semi-light transmitting unit 121 group are arranged in one-to-one correspondence with the gaps between the adjacent two light emitting elements 23. For example, as shown in fig. 1 and 3, the semi-transparent film includes two semi-transparent units 121 and two first medium layers 122, each semi-transparent unit 121 includes a plurality of semi-transparent units 121, the two first medium layers 122 are disposed in one-to-one correspondence with the two semi-transparent units 121, that is, one first medium layer 122 of the two first medium layers 122 is disposed on one side of the plurality of semi-transparent units 121 of one semi-transparent unit 121 of the two semi-transparent units 121, which is far from the plurality of light emitting elements 23, and in a gap between the two adjacent semi-transparent units 121, the other first medium layer 122 is disposed on one side of the plurality of semi-transparent units 121 of the other semi-transparent unit 121, which is far from the plurality of light emitting elements 23, and is disposed in a gap between the two adjacent semi-transparent units 121, the two semi-transparent units 121 are sequentially disposed along a direction far from the plurality of light emitting elements 23, that is, the plurality of semi-transparent units 121 in another semi-transparent unit 121 group may be disposed on one side of the first medium layer 122 away from the plurality of light-emitting elements 23, the plurality of semi-transparent units 121 in each semi-transparent unit 121 group are all arranged at intervals, and the direction in which the plurality of semi-transparent units 121 in each semi-transparent unit 121 group are all parallel to the direction in which the plurality of light-emitting elements 23 are arranged at intervals, and are all configured to be disposed in one-to-one correspondence with the gaps between two adjacent light-emitting elements 23, which also enables the plurality of semi-transparent units 121 in one semi-transparent unit 121 group to be disposed in one-to-one correspondence with the plurality of semi-transparent units 121 in another semi-transparent unit 121 group. By providing the plurality of semi-transmissive units 121 and the plurality of first dielectric layers 122, light needs to sequentially pass through the plurality of semi-transmissive units 121 and the plurality of first dielectric layers 122 in the process of entering the plurality of light-emitting elements 23 from the outside, so that the light reflected by the light-emitting elements 23 can be further reduced, and the display contrast can be improved. However, the number of the sets of the semi-transmissive units 121 and the first dielectric layer 122 is not limited thereto, and may be three, four or more, for example.

The transmittance of the semi-transmissive film layer 12 can be adjusted by adjusting the thickness of the semi-transmissive unit 121 or adjusting the number of the sets of semi-transmissive units 121. Optionally, the transmittance of the semi-transparent film layer 12 may be 30% to 60%.

Optionally, the transmittance of the semi-transparent film layer 12 may be 40% to 50%.

Alternatively, the transmittance of the semi-transparent film layer 12 may be 40%.

When the reflectivity of the semi-transparent film layer 12 corresponding to the gap between the two adjacent light emitting elements 23 is 30% -35% and the transmittance of the semi-transparent film layer 12 is 40%, the reflectivity of light passing through the two semi-transparent film layers 12 from the outside can be reduced to 5% -7%.

As shown in fig. 6, the abscissa of fig. 6 is the wavelength of light, the ordinate is the transmittance (T%) and the reflectance (R%) of the light-transmitting film layer, and when the first dielectric layer 122 of the semi-light-transmitting film layer 12 is silicon dioxide with a thickness of 80 nanometers (nm), the second dielectric layer 123 is silicon dioxide with a thickness of 80 nm, and the semi-light-transmitting unit 121 is titanium with a thickness of 5 nm, the transmittance of the semi-light-transmitting film layer 12 is 58% and the reflectance is 3%.

As shown in fig. 1 and fig. 3, in a preferred embodiment of the present invention, the filter film layer 11 may include a plurality of filter units 111, the filter units 111 are arranged at intervals, a direction in which the filter units 111 are arranged at intervals is parallel to a direction in which the light-emitting elements 23 are arranged at intervals, the filter units 111 are arranged in one-to-one correspondence with the light-emitting elements 23, the light-emitting elements 23 corresponding to the filter units 111 can emit light that can be transmitted by the filter units 111, and each filter unit 111 can absorb light with a wavelength other than a part of the wavelength that can be transmitted by the filter unit 111.

That is, on the light emitting side of the light emitting elements 23, the filter unit 111 is provided at a position corresponding to the light emitting elements 23, and one filter unit 111 is provided at a position corresponding to each light emitting element 23 in a direction parallel to the direction in which the light emitting elements 23 are arranged at intervals, so that the light emitting element 23 corresponding to each filter unit 111 can emit light that can be transmitted by the filter unit 111, and each filter unit 111 can absorb light having a wavelength other than a partial wavelength that can be transmitted by the filter unit 111, and therefore, the filter units 111 can transmit light emitted by the light emitting elements 23, and absorb light having a wavelength other than a partial wavelength that can be transmitted by the filter unit 111, so that the display device can normally display an image, and at least a part of natural light can be irradiated onto the light emitting elements 23 through the filter unit 111, and the part of light irradiated onto the light emitting elements 23 through the filter unit 111 and the light emitted by the light emitting elements 23 The wavelengths of the light emitted through the filter unit 111 in the natural light belong to the same wavelength, and the light of the wavelengths except the light of the part of the wavelengths can be irradiated onto the light emitting element 23 through the filter unit 111, and the light of the other wavelengths is absorbed by the filter unit 111 and cannot be irradiated onto the light emitting element 23.

As shown in fig. 1 to 5, for example, the plurality of light emitting elements 23 may be a red light emitting element 23, a green light emitting element 23, and a blue light emitting element 23, respectively, wherein the red light emitting element 23 can emit red light, the green light emitting element 23 can emit green light, and the blue light emitting element 23 can emit blue light, and the plurality of filter units may be a red filter unit, a green filter unit, and a blue filter unit, respectively, wherein the red filter unit can transmit red light and absorb light of colors other than red light, the green filter unit can transmit green light and absorb light of colors other than green light, and the blue filter unit can transmit blue light and absorb light of colors other than blue light. In this case, the red filter unit is disposed corresponding to the red light emitting element 23 so that the red light emitted from the red light emitting element 23 can be transmitted, and absorbs the light of the colors other than the red light in the natural light so that the light of the colors other than the red light cannot be irradiated onto the red light emitting element 23, the green filter unit is disposed corresponding to the green light emitting element 23 so that the green light emitted from the green light emitting element 23 can be transmitted, and absorbs the light of the colors other than the green light in the natural light so that the light of the colors other than the green light cannot be irradiated onto the green light emitting element 23, and the blue filter unit is disposed corresponding to the blue light emitting element 23 so that the blue light emitted from the blue light emitting element 23 can be transmitted, and absorbs the light of the colors other than the blue light in the natural light so that the light of the colors other than the blue light cannot be irradiated onto the blue light emitting element 23.

As shown in fig. 5, the green light emitting element 23 may alternatively be a first sub-green light emitting part and a second sub-green light emitting part, which are spaced apart in a direction perpendicular to the direction in which the plurality of light emitting elements 23 are spaced apart, each of the first sub-green light emitting part and the second sub-green light emitting part being capable of emitting green light, in this case, the green filter unit may be a first sub-green filter portion and a second sub-green filter portion, the first sub-green filter portion and the second sub-green filter portion being provided at intervals in a direction perpendicular to a direction in which the plurality of light emitting elements 23 are arranged at intervals, the first sub-green filter portion being provided in correspondence with the first sub-green light emitting portion, and the second sub-green filter part is arranged corresponding to the second sub-green light-emitting part and is used for transmitting the green light emitted by the second sub-green light-emitting part.

Alternatively, the Filter unit 111 may be a Color Filter (CF).

As shown in fig. 1 and fig. 3, in a preferred embodiment of the present invention, the filter film layer 11 may further include a flat protection layer 112, where the flat protection layer 112 is disposed on a side of the plurality of filter units 111 away from the plurality of light emitting elements 23, and is disposed in a gap between two adjacent filter units 111. The flat protection layer 112 can protect the plurality of filter units 111 and can planarize the surface of the filter film layer 11, thereby facilitating the subsequent processes on the filter film layer 11.

As shown in fig. 3, in a preferred embodiment of the present invention, the filter film 11 may further include a third dielectric layer 113, the third dielectric layer 113 is disposed on a side of the flat protective layer 112 away from the plurality of light emitting elements 23 and covers the flat protective layer 112, and a refractive index of the third dielectric layer 113 is between a refractive index of the flat protective layer 112 and a refractive index of a dielectric on a side of the third dielectric layer 113 away from the plurality of light emitting elements 23.

This is because when the filter layer 11 is disposed on the side of the semi-transparent layer 12 away from the plurality of light-emitting elements 23, the flat protective layer 112 may contact with air, and by disposing the third dielectric layer 113 on the side of the flat protective layer 112 away from the plurality of light-emitting elements 23 and making the refractive index of the third dielectric layer 113 between the refractive index of the flat protective layer 112 and the refractive index of the dielectric on the side of the third dielectric layer 113 away from the plurality of light-emitting elements 23, when light is incident on the filter layer 11 from the dielectric (for example, air) on the side of the third dielectric layer 113 away from the plurality of light-emitting elements 23, the light is incident on the third dielectric layer 113 first and then incident on the flat protective layer 112. Since the refractive index of the third medium layer 113 is between the refractive index of the flat protective layer 112 and the refractive index of the medium on the side away from the plurality of light-emitting elements 23 with respect to the third medium layer 113, the difference between the refractive index of the third medium layer 113 and the refractive index of the medium on the side away from the plurality of light-emitting elements 23 with respect to the third medium layer 113 is smaller than the difference between the refractive index of the medium on the side away from the plurality of light-emitting elements 23 with respect to the third medium layer 113 and the refractive index of the flat protective layer 112, so that the reflectance of light incident on the third medium layer 113 from the medium on the side away from the plurality of light-emitting elements 23 with respect to the third medium layer 113 is smaller than the reflectance of light incident on the flat protective layer 112 from the medium on the side away from the plurality of light-emitting elements 23 with respect to the third medium layer 113, and since the refractive index of the third medium layer 113 is between the refractive index of the flat protective layer 112 and the refractive index of the medium on the side away from the plurality of light-emitting elements 23 with respect to the third medium layer 113, therefore, the difference between the refractive index of the third dielectric layer 113 and the refractive index of the flat protective layer 112 is smaller than the difference between the refractive index of the medium far away from the plurality of light-emitting elements 23 relative to the third dielectric layer 113 and the refractive index of the flat protective layer 112, so that the reflectivity of light incident on the flat protective layer 112 from the third dielectric layer 113 is smaller than the reflectivity of light incident on the flat protective layer 112 from the medium far away from the plurality of light-emitting elements 23 relative to the third dielectric layer 113, and thus the reflectivity of light incident on the filter layer 11 from the medium far away from the plurality of light-emitting elements 23 relative to the filter layer 11 can be reduced by means of the third dielectric layer 113, the reflection of the optical film 1 can be reduced, and the display contrast can be further improved.

Alternatively, the material of the third dielectric layer 113 may include silicon dioxide (SiO)₂)。

Optionally, the thickness of the third dielectric layer 113 may be 800 angstroms.

Optionally, the third dielectric layer 113 may include a first sub-dielectric layer and a second sub-dielectric layer, where the first sub-dielectric layer is disposed on a side of the flat protective layer 112 away from the plurality of light emitting elements 23 and covers the flat protective layer 112, a refractive index of the first sub-dielectric layer is between a refractive index of the flat protective layer 112 and a refractive index of the second sub-dielectric layer, a material of the first sub-dielectric layer may include silicon dioxide, the second sub-dielectric layer is disposed on a side of the first sub-dielectric layer away from the plurality of light emitting elements 23 and covers the first sub-dielectric layer, a refractive index of the second sub-dielectric layer is between a refractive index of the first sub-dielectric layer and a refractive index of a medium opposite to the side of the second sub-dielectric layer 3 away from the plurality of light emitting elements 23, and a material of the second sub-dielectric layer may include silicon nitride. The second sub-dielectric layer of silicon nitride can provide a water and oxygen blocking effect, so that water and oxygen are prevented from entering the semi-transparent film layer 12 positioned below the second sub-dielectric layer, and the reliability of the semi-transparent film layer 12 is improved.

Optionally, the thickness of the first sub-dielectric layer may be 800 angstroms.

Optionally, the thickness of the second sub-dielectric layer may be 2000 angstroms.

As shown in fig. 2 and 4, in a preferred embodiment of the present invention, the optical film 1 may further include a transparent protective layer 13, and the transparent protective layer 13 is disposed on a side of one of the filter layer 11 and the semi-transparent layer 12, which is far from one of the plurality of light-emitting elements 23, which is far from the plurality of light-emitting elements 23. For example, when the semi-transmissive film layer 12 is disposed on the side of the filter layer 11 away from the plurality of light-emitting elements 23, the transparent protective layer 13 is disposed on the side of the semi-transmissive film layer 12 away from the plurality of light-emitting elements 23 (as shown in fig. 2), and when the filter layer 11 is disposed on the side of the semi-transmissive film layer 12 away from the plurality of light-emitting elements 23, the transparent protective layer 13 is disposed on the side of the filter layer 11 away from the plurality of light-emitting elements 23 (as shown in fig. 4).

As shown in fig. 1 to 4, an embodiment of the present invention further provides a display device, including a light emitting element 2 and an optical film 1 provided in an embodiment of the present invention, where the optical film 1 is disposed on a light emitting side of the light emitting element 2.

According to the display device provided by the embodiment of the invention, the optical film 1 provided by the embodiment of the invention is arranged on the light emergent side of the light emitting component 2, so that the light reflected by the organic electroluminescent element can be reduced, the display contrast is improved, the capability of repeatedly folding the flexible screen is improved, and the display device is compatible with the optical sensing function under the screen and the fingerprint identification function under the screen.

As shown in fig. 1 to 4, the light emitting assembly 2 may include a Substrate 21(Substrate), a back plane 22(back plane, BP), a plurality of light emitting elements 23, a Thin-Film Encapsulation 24 (TFE), and a Buffer layer 25(Buffer), wherein the back plane 22 is disposed on the Substrate 21 and is used for driving the light emitting elements 23 disposed thereon to emit light, the light emitting elements 23 are disposed on the back plane 22 at intervals, the Thin-Film Encapsulation 24 is disposed on a side of the light emitting elements 23 away from the Substrate 21 and is disposed in a gap between two adjacent light emitting elements 23, the Buffer layer 25 is disposed on a side of the Thin-Film Encapsulation 24 away from the Substrate 21, and the optical Film 1 is disposed on a side of the Buffer layer 25 away from the Substrate 21. However, the structure of the light emitting device 2 provided by the embodiment of the present invention is not limited thereto.

A method for manufacturing a display device according to an embodiment of the present invention is described below, which may be used to manufacture the semi-transmissive film layer 12 on the side of the filter film layer 11 away from the plurality of light-emitting elements 23, and the method includes: preparing a driving array backplate 22 on a substrate 21, preparing a plurality of light emitting elements 23 on the substrate 21 with the driving array backplate 22, preparing a thin film package 24 on the substrate 21 with the plurality of light emitting elements 23, preparing a buffer layer 25 on the substrate 21 with the thin film package 24, preparing a plurality of light filtering units 111 on the substrate 21 with the buffer layer 25, preparing a flat protective layer 112 on the substrate 21 with the plurality of light filtering units 111, preparing a second dielectric layer 123 on the substrate 21 with the flat protective layer 112, preparing a plurality of semi-light transmitting units 121 on the substrate 21 with the second dielectric layer 123, preparing a first dielectric layer 122 on the substrate 21 with the plurality of semi-light transmitting units 121, and preparing a transparent protective layer 13 on the substrate 21 with the first dielectric layer 122.

When it is required to prepare a plurality of sets of the semi-transmissive units 121 and a plurality of first dielectric layers 122, the preparation method may further include: preparing a plurality of semi-transparent units 121 of another semi-transparent unit 121 group on the substrate 21 with the first medium layer 122, preparing another first medium layer 122 on the substrate 21 with the plurality of semi-transparent units 121 of another semi-transparent unit 121 group until the plurality of semi-transparent units 121 and the plurality of first medium layers 122 are prepared, and preparing the transparent protective layer 13 on the substrate 21 with the plurality of semi-transparent units 121 and the plurality of first medium layers 122. However, the method for manufacturing the display device provided by the embodiment of the invention is not limited thereto.

Another method for manufacturing a display device according to another embodiment of the present invention is described below, which can be used to manufacture the light filtering film layer 11 on the side of the semi-transparent film layer 12 away from the plurality of light emitting elements 23, and the manufacturing method includes: a driving array backplane 22 is prepared on a substrate 21, a plurality of light emitting elements 23 are prepared on the substrate 21 on which the driving array backplane 22 is prepared, a thin film package 24 is formed on a substrate 21 on which a plurality of light emitting elements 23 are formed, a buffer layer 25 is formed on the substrate 21 on which the thin film package 24 is formed, a second dielectric layer 123 is formed on the substrate 21 on which the buffer layer 25 is formed, a plurality of semi-transmissive units 121 are formed on the substrate 21 on which the second dielectric layer 123 is formed, a first dielectric layer 122 is prepared on the substrate 21 on which the plurality of semi-transmissive units 121 are prepared, a plurality of filter units 111 are prepared on the substrate 21 on which the first dielectric layer 122 is prepared, a flat protective layer 112 is prepared on the substrate 21 on which the plurality of filter units 111 are prepared, a third dielectric layer 113 is prepared on the substrate 21 prepared with the flat protective layer 112, and a transparent protective layer 13 is prepared on the substrate 21 prepared with the third dielectric layer 113.

When a plurality of semi-transparent units 121 and a plurality of first dielectric layers 122 need to be prepared, a plurality of semi-transparent units 121 of another semi-transparent unit 121 group are prepared on the substrate 21 with the first dielectric layer 122, another first dielectric layer 122 is prepared on the substrate 21 with a plurality of semi-transparent units 121 of another semi-transparent unit 121 group, and a plurality of filtering units 111 are prepared on the substrate 21 with a plurality of semi-transparent units 121 and a plurality of first dielectric layers 122 until the plurality of semi-transparent units 121 and the plurality of first dielectric layers 122 are prepared. However, the method for manufacturing the display device provided by the embodiment of the invention is not limited thereto.

Alternatively, the driving array backplane 22 prepared on the substrate 21 may include Low Temperature Polysilicon (LTPS) or Oxide (Oxide).

Alternatively, the plurality of light emitting elements 23 may be prepared by evaporation or a solution process.

Alternatively, the Light Emitting element 23 may include an Organic Light-Emitting Diode (OLED).

Alternatively, the thin film encapsulation 24 may be prepared by sequentially depositing an inorganic layer, an organic layer, and an inorganic layer.

Alternatively, the buffer layer 25 may be prepared by deposition.

Alternatively, the material of the buffer layer 25 may include silicon nitride (SiNx).

Alternatively, the plurality of filter units 111 may be prepared by means of separate exposure.

Alternatively, the flat protective layer 112 may be prepared by coating and exposing.

Optionally, the semi-transmissive units 121 may be prepared by Mask (Mask) vacuum evaporation, or by Physical Vapor Deposition (PVD) followed by exposure etching.

Alternatively, the first dielectric layer 122 may be prepared by deposition.

Alternatively, the second dielectric layer 123 may be prepared by deposition.

Alternatively, the third dielectric layer 113 may be prepared by deposition.

Alternatively, the transparent protective layer 13 may be prepared by deposition or coating.

In summary, the optical film 1 and the display device provided in the embodiments of the present invention can reduce light reflected by the organic electroluminescent element, improve display contrast, improve the capability of repeatedly folding the flexible screen, and are compatible with the optical sensing function under the screen and the fingerprint identification function under the screen.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.