Patent Application
20170069878
Embodiments of the present disclosure relate to an OLED display apparatus and a method for preparing the same.
Displays using OLED (Organic Light-Emitting Diode) are novel flat panel display devices, and their future is bright owing to their advantages such as simple procedure, low cost, fast response, easiness to achieve color display and large screen display, low power consumption, easiness to match with an integrated circuit driver, great brightness, broad application range of operating temperature, small volume and easiness to achieve flexible display.
Embodiments of the present disclosure provide an OLED display apparatus, comprising a flexible substrate, an array layer disposed on the flexible substrate, an organic light-emitting layer disposed on the array layer, a package layer disposed on the organic light-emitting layer, and a base film disposed on a side of the flexible substrate facing away from the array layer, a plurality of protruded microstructures being provided on the side of the flexible substrate facing away from the array layer.
Embodiments of the present disclosure further provide a method for preparing an OLED display apparatus, comprising: forming a plurality of protruded microstructures on one side of the flexible substrate; forming an array layer, an organic light-emitting layer and a package layer sequentially on the other side of the flexible substrate.
In order to clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments are briefly described below. Apparently, the drawings described below relate to only some embodiments of the present disclosure and thus are not limitative of the present disclosure.
01—base film; 02—flexible substrate; 03—array layer; 04—organic light-emitting layer; 05—package layer, 1—base film; 2—flexible substrate; 21—microstructure; 3—array layer; 4—organic light-emitting layer; 5—package layer; 6—base substrate; 7—laser beam.
To make clearer the objects, technical solutions and advantages of the embodiments of the present disclosure, a clear and full description of the technical solutions of the embodiments of the present disclosure will be made with reference to the accompanying drawings of the embodiments of the present disclosure. Apparently, the described embodiments are just part rather than all of the embodiments of the present disclosure. Based on the embodiments of the present disclosure described, all the other embodiments obtained by a person of ordinary skill in the art, without any creative labor, fall within the scope of protection of the present disclosure.
The overall light exiting efficiency of an OLED display apparatus is not high. As shown in
A method for improving the light exiting efficiency of an OLED display apparatus comprises: attaching a lens array film to a luminous substrate, and using a photonic crystal structure layer, a high refractive index substrate, etc. to enhance the light extraction efficiency of the OLED display apparatus. While improving light extraction efficiency, this method, however, introduces some problems, for example: movement of exiting light spectra, change of electrical properties, reduction of flexible bending ability, etc., and the process is more complex and at a higher cost.
Embodiments of the present disclosure provide an OLED display apparatus and a method for preparing the same to improve the light extraction efficiency of the OLED display apparatus.
Embodiments of the present disclosure provide an OLED display apparatus, comprising: a flexible substrate, an array layer disposed on the flexible substrate, an organic light-emitting layer disposed on the array layer, a package layer disposed on the organic light-emitting layer, and a base film disposed on the side of the flexible substrate facing away from the array layer, a plurality of protruded microstructures being provided on the side of the flexible substrate facing away from the array layer.
As for the OLED display apparatus according to embodiments of the present disclosure, by providing a plurality of microstructures protruded in a direction away from the array layer on the side of the flexible substrate facing away from the array layer, the incident angle of light on the base film after coming out from the array layer can be changed, so that the incident angle on the base film is less than the total reflection critical angle of the base film, the occurrence of total reflection of incident light on the base film is reduced, the light emitted from the organic light-emitting layer is refracted from the side of the base film facing away from the flexible substrate as much as possible, and the light exiting efficiency of the base film is improved.
Hence, the OLED display apparatus according to embodiments of the present disclosure can improve the light extraction efficiency of the OLED display apparatus.
In some embodiments, the plurality of microstructures and the flexible substrate are integral, which facilitates making.
In some embodiments, the plurality of microstructures are distributed uniformly.
In some embodiments, each hemispherical microstructure has a radian of 1 rad to 10 rad.
In some embodiments, each of the microstructures is semi-ellipsoidal.
Embodiments of the present disclosure further provide a method for preparing an OLED display apparatus, comprising: forming a plurality of protruded microstructures on one side of the flexible substrate; forming an array layer, an organic light-emitting layer and a package layer sequentially on the other side of the flexible substrate.
A display apparatus is prepared by the method for preparing an OLED display apparatus according to embodiments of the present disclosure. By forming a plurality of microstructures protruded in a direction away from the array layer on the side of the flexible substrate facing away from the array layer, the incident angle of light on the base film after coming out from the array layer may be changed, the occurrence of total reflection of incident light on the base film is reduced, and the light exiting efficiency of the base film is improved.
Hence, the method for preparing an OLED display apparatus according to embodiments of the present disclosure can improve the light extraction efficiency of the OLED display apparatus, and the preparation process is simple.
In some embodiments, forming a plurality of protruded microstructures on one side of the flexible substrate specifically comprises: forming a plurality of recesses on a side of a base substrate; forming a flexible substrate on the side of the base substrate where the plurality of recesses are formed, a plurality of microstructures corresponding to and matchable with the plurality of recesses one by one being formed on the side of the flexible substrate facing toward the base substrate.
In some embodiments, the above preparation method further comprises: peeling off the base substrate from the flexible substrate; providing a base film on the side of the flexible substrate where the plurality of the microstructures are formed.
In some embodiments, forming a plurality of protruded microstructures on one side of the flexible substrate specifically comprises: forming a plurality of recesses on a side of the base film; forming a flexible substrate on the side of the base film where the plurality of recesses are formed, a plurality of microstructures corresponding to and matchable with the plurality of recesses one by one being formed on the side of the flexible substrate facing toward the base film.
In some embodiments, each of the microstructures is protruded in a direction away from the array layer.
In some embodiments, each of the recesses is recessed towards the base film.
With the OLED display apparatus according to embodiments of the present disclosure, by providing a plurality of microstructures 21 protruded in a direction away from the array layer 3 on the side of the flexible substrate 2 facing away from the array layer 3, the incident angle of light on the base film 1 after coming out from the array layer 3 can be changed, so that the incident angle on the base film 1 is less than the total reflection critical angle of the base film 1, the occurrence of total reflection of incident light on the base film 1 is reduced, the light emitted from the organic light-emitting layer 4 is refracted from the side of the base film 1 facing away from the flexible substrate 2 as much as possible, and the light exiting efficiency of the base film 1 is improved.
Hence, the OLED display apparatus according to embodiments of the present disclosure can improve the light extraction efficiency of the OLED display apparatus.
In one embodiment, the plurality of microstructures 21 and the flexible substrate are integral, which facilitates making. In another embodiment, the plurality of microstructures 21 and the flexible substrate are prepared separately and then, for example, are bonded together.
In one embodiment, the plurality of microstructures 21 are distributed uniformly.
The specific shape of each of the above microstructures 21 may have many options.
In one alternative embodiment, for example, each microstructure 21 is hemispherical. Further, for example, each hemispherical microstructure 21 has a radian of 1 rad to 10 rad, for example: 1 rad, 2 rad, 3 rad, 4 rad, 5 rad, 6 rad, 7 rad, 8 rad, 9 rad, 10 rad, etc.
In another alternative embodiment, each microstructure 21 is semi-ellipsoidal.
Step S301: forming a plurality of microstructures 21 protruded in a direction away from the flexible substrate 2 on one side of the flexible substrate 2;
Step S302: forming an array layer 3, an organic light-emitting layer 4 and a package layer 5 sequentially on the other side of the flexible substrate 2.
The display apparatus is prepared by the method for preparing an OLED display apparatus according to the present embodiments. By forming a plurality of microstructures 21 protruded in a direction away from the array layer 3 on the side of the flexible substrate 2 facing away from the array layer 3, the incident angle of light on the base film 1 after coming out from the array layer 3 may be changed, the occurrence of total reflection of incident light on the base film 1 is reduced, and the light exiting efficiency of the base film 1 is improved.
Hence, the method for preparing an OLED display apparatus according to embodiments of the present disclosure can improve the light extraction efficiency of the OLED display apparatus, and the preparation process is simple.
A plurality of recesses recessed towards the base substrate 6 is formed on a side of the base substrate 6; for example, such recesses may be formed on a side of the base substrate 6 by a laser beam 7. The structure formed is as shown in
A flexible substrate 2 is formed on the side of the base substrate 6 where the plurality of recesses are formed, a plurality of microstructures 21 corresponding to and matchable with the plurality of recesses one by one being formed on the side of the flexible substrate 2 facing toward the base substrate 6. For example, the material for forming the flexible substrate 2 is typically liquid; the material for forming the flexible substrate 2 is injected to the base substrate 6 provided with recesses, and after curing, a plurality of microstructures 21 will be formed on the side of the flexible substrate 2 facing toward the base substrate 6. The structures formed are as shown in
Subsequently, Step S302 is carried out. An array layer 3, an organic light-emitting layer 4 and a package layer 5 are sequentially formed on the other side of the flexible substrate 2. The structure formed is as shown in
Further, the above preparation method further comprises: peeling off the base substrate 6 from the flexible substrate 2; the structure of the OLED display apparatus formed after the step is as shown in
A base film 1 is attached to the side of the flexible substrate 2 provided with a plurality of microstructures 21. The structure of the OLED display apparatus formed after the step is as shown in
In another embodiment, Step S301: forming a plurality of microstructures 21 protruded in a direction away from the flexible substrate on a side of the flexible substrate 2, which, for example, may be carried out specifically as follows.
A plurality of recesses recessed towards the base film 1 is formed on a side of the base film 1; a flexible substrate 2 is formed on the side of the base film 1 where the plurality of recesses are formed, a plurality of microstructures 21 corresponding to and matchable with the plurality of recesses one by one being formed on the side of the flexible substrate 2 facing toward the base film 1.
Hence, in some embodiments, each of the microstructures is a protrusion.
In some embodiments, for example, the cross-section of the protrusion is semi-circular or semi-ellipsoidal.
In some embodiments, for example, the plurality of microstructures occupies no less than 50% of an area of the flexible substrate. The greater the area of the flexible substrate the microstructures occupy, the more the light exiting efficiency will be improved. Therefore, the area of the flexible substrate the microstructures occupy may be greater than 60%, greater than 70%, greater than 80%, or greater than 90%.
In some embodiments, for example, each of the microstructures may have a size of 100 nm to 1 mm. The size of each of the microstructures may be any one size within the range of 100 nm to 1 mm, for example, 200 nm, 300 nm, 400 nm, 500 nm, 600 nm, 700 nm, 1 micron, 10 microns, 100 microns, 500 microns, etc. In the present application, the size of the microstructure refers to the average value of the two smaller extents (sizes) of each microstructure in a three-dimensional space. For example, when the microstructure is a protrusion (the cross-section being a semi-ellipsoid), the size of the microstructure may be the average value of the long axis a and the short axis b of the semi-ellipsoid, i.e., (a+b)/2. For example, when the microstructure is a protrusion (the cross-section being a semi-sphere), the size of the microstructure may be the diameter of the semi-sphere.
The above are merely exemplary embodiments of the present disclosure, and are not intended to limit the scope of protection of the present disclosure, which is yet determined by the appended claims.
The present application claims the priority of the Chinese patent application No. 201510569895.5 submitted on Sep. 9, 2015, and the content disclosed in the above Chinese patent application is incorporated herein by reference as part of the present application.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201510569895.5 | Sep 2015 | CN | national |
