WO2019090837A1

WO2019090837A1 - Double-sided display, and manufacturing method thereof

Info

Publication number: WO2019090837A1
Application number: PCT/CN2017/112570
Authority: WO
Inventors: 徐超
Original assignee: 武汉华星光电半导体显示技术有限公司
Priority date: 2017-11-08
Filing date: 2017-11-23
Publication date: 2019-05-16
Also published as: CN107799017A

Abstract

The present invention provides a double-sided display. The display comprises an organic electroluminescent display panel. A packaging layer of the organic electroluminescent display panel is provided with a liquid crystal layer thereabove, and the liquid crystal layer is provided with a cover glass plate thereon. An alignment film is provided between the liquid crystal layer and a packaging layer. A transparent electrode layer is provided between the cover glass plate and the liquid crystal layer. The orientation of liquid crystal molecules in the liquid crystal layer is controlled by controlling a voltage of the transparent electrode layer, thereby achieving single-sided or double-sided display. The present invention further provides a manufacturing method of the double-sided display. Compared with the prior art, the alignment film, the liquid crystal layer, the transparent electrode layer, and the cover glass plate are fabricated on the organic electroluminescent display panel, orientation control of the liquid crystal molecules is achieved by voltage control of the transparent electrode layer, thereby achieving single-sided and double-sided display functions. The present invention has a simple structure and manufacturing process, and sufficiently utilizes LCD manufacturing processes to lower costs of double-sided displays.

Description

Double-sided display and manufacturing method thereof

Technical field

The invention relates to a liquid crystal display panel technology, in particular to a double-sided display and a manufacturing method thereof.

Background technique

OLED (Organic Light-Emitting Diode) displays have the advantages of high brightness, fast response, low power consumption, and flexibility, and are widely recognized as the focus of next-generation display technology. Compared with TFT-LCD (Thin Film Transistor, Liquid Crystal Display), the biggest advantage of OLED display is that it can produce large size, ultra-thin, flexible, transparent and double-sided display devices.

As the form of electronic products has become more diversified, the double-sided display function has become a major feature of the new generation of electronic products, especially display products in some public places. However, most of the current double-sided OLED display devices only back-back assembly of two independent OLED display devices to achieve double-sided display, the structure is relatively heavy, the process is relatively complicated, the manufacturing cost is high, and the lightness and highness that do not meet the consumer's expectations are high. Cost-effective requirements.

Summary of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a double-sided display and a manufacturing method thereof, which make the structure and manufacturing process of the double-sided display simple and low in cost.

The present invention provides a double-sided display comprising an organic electroluminescent display panel, the encapsulation layer of the organic electroluminescent display panel is provided with a liquid crystal layer, and a cover glass is disposed on the liquid crystal layer, and the liquid crystal layer is An alignment film is disposed between the encapsulation layers, and a transparent electrode layer is disposed between the cover glass and the liquid crystal layer. By controlling the voltage of the transparent electrode layer, the deflection of the liquid crystal molecules of the liquid crystal layer is controlled to realize single or double-sided display.

Further, the anode and the cathode of the organic electroluminescence display panel are made of a transparent conductive material.

Further, the substrate of the organic electroluminescent display panel faces away from a side surface of the alignment film to And a lower polarizer and an upper polarizer are respectively disposed on a side surface of the cover glass facing away from the transparent electrode layer.

Further, the polarization directions of the lower polarizer and the upper polarizer are perpendicular to each other.

Further, a plastic frame is further disposed between the alignment film and the transparent electrode layer, and the liquid crystal layer is disposed in the plastic frame.

The invention also provides a method for manufacturing a double-sided display, comprising the following steps:

Making an organic electroluminescent display panel;

Forming an alignment film on an encapsulation layer of the organic electroluminescence display panel;

Making a plastic frame on the alignment film;

Making a liquid crystal layer in the plastic frame;

Laminating the cover glass on the liquid crystal layer;

Providing a lower polarizer and an upper polarizer on a side surface of the substrate of the organic electroluminescence display panel facing away from the alignment film and a surface of the cover glass facing away from the transparent electrode layer;

A transparent electrode layer is plated between the cover glass and the liquid crystal layer.

Further, in fabricating the organic electroluminescence display panel, the anode and the cathode of the organic electroluminescence display panel are made of a transparent conductive material.

Further, after the cover glass is attached to the liquid crystal layer, it is cured by ultraviolet light.

Further, the anode is an indium tin oxide semiconductor transparent conductive film or an indium zinc oxide semiconductor transparent conductive film; the cathode is one of Mg or Ag.

Compared with the prior art, the invention can produce the alignment film, the liquid crystal layer, the transparent electrode layer and the cover glass on the organic electroluminescence display panel, and control the voltage of the transparent electrode layer to control the deflection of the liquid crystal molecules. The single-sided and double-sided display functions not only have a simple structure and a simple manufacturing process, but also make full use of the manufacturing process of the LCD, so that the cost of the double-sided display is low.

DRAWINGS

1 is a schematic view showing the basic structure of an organic electroluminescence display panel of the present invention;

2 is a schematic view showing the structure of an alignment film formed on an encapsulation layer of the present invention;

3 is a schematic view showing the structure of a plastic frame and a liquid crystal layer formed on an alignment film of the present invention;

4 is a schematic structural view of the cover glass and the box formed by the present invention;

Fig. 5 is a schematic structural view of an organic electroluminescence display panel of the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

As shown in FIG. 4, a double-sided display of the present invention includes an organic electroluminescent display panel 1. The organic electroluminescent display panel 1 can adopt the structure of the organic electroluminescent display panel 1 of the prior art. The anode 12 and the cathode 13 of the organic electroluminescent display panel 1 are made of a transparent conductive material, thereby realizing double-sided illumination of the organic electroluminescent display panel 1; A liquid crystal layer 2 is disposed on the encapsulation layer 11 of the light-emitting display panel 1, and a cover glass 5 is disposed on the liquid crystal layer 2. An alignment film 3 is disposed between the liquid crystal layer 2 and the encapsulation layer 11, and the cover glass 5 is disposed. A transparent electrode layer 4 is disposed between the liquid crystal layer 2, and the voltage of the transparent electrode layer 4 is controlled to control the deflection of the liquid crystal molecules of the liquid crystal layer 2 to realize single or double-sided display; the alignment film 3 and the transparent electrode layer 4 There is also a plastic frame 6 disposed in the plastic frame 6; on the side surface of the substrate 14 of the organic electroluminescent display panel 1 facing away from the alignment film 3 and the cover glass 5 facing away from the transparent electrode layer 4 a lower polarizer 7 and upper side are respectively provided on one side surface Polarizer 8.

The invention realizes the single-sided display function by controlling the voltage of the transparent electrode to cause the liquid crystal layer 2 to be deflected under the control of the cathode 13 and the transparent electrode layer 4. Here, the control of the transparent electrode can be performed by using the prior art. It is not specifically limited herein, and it is only necessary to ensure that a voltage is input to the transparent electrode layer, for example, by controlling the transparent motor layer 4 in the existing liquid crystal display.

In the present invention, the polarization directions of the lower polarizer 7 and the upper polarizer 8 are perpendicular to each other.

In the present invention, the anode 12 is made of an indium tin oxide semiconductor transparent conductive film or indium zinc oxide. The semiconductor transparent conductive film; the cathode 13 is one of Mg or Ag.

In the present invention, as shown in FIG. 5, the organic electroluminescence display panel 1 includes at least a substrate 14, a thin film transistor 15, an anode 12, a pixel defining layer (not shown), an organic electroluminescent device 16, and a cathode 13.

The thin film transistor 15 may include a buffer layer 141, a polysilicon layer 142, a gate insulating layer 143, a gate electrode 144, an interlayer insulating layer 145, a source electrode 146, a drain electrode 147, and a flat layer 148 which are sequentially disposed, but the present invention The structure of the thin film transistor is not limited thereto, and it may be another type of thin film transistor such as an amorphous silicon thin film transistor or a metal oxide thin film transistor.

The anode 12 is in contact with the drain electrode 147 through the hole; the pixel defining layer 149 is disposed on the flat layer 148 and the anode 12; the organic electroluminescent device 16 is disposed on the anode 12; and the cathode 13 is disposed on the organic electroluminescent device 16.

The organic electroluminescent device 16 includes, in order from the anode 12 to the cathode, a hole injection layer (HIL) 161, a hole transport layer (HTL) 162, an organic light emitting layer (EML) 163, an electron transport layer (ETL) 164, and Electron injection layer (EIL) 165; however, the organic electroluminescent device 16 of the present invention is not limited to the structure herein.

A method for manufacturing a double-sided display of the present invention comprises the following steps:

As shown in FIG. 1 and FIG. 2, the organic electroluminescent display panel 1 is fabricated; the fabrication of the organic electroluminescent display panel 1 can be performed by using the prior art, and is not specifically limited herein; When the organic electroluminescence display panel 1 is produced, the anode 12 and the cathode 13 of the organic electroluminescence display panel 1 may be made of a transparent conductive material.

As shown in FIG. 2, an alignment film 3 is formed on the encapsulation layer 11 of the organic electroluminescence display panel 1. Specifically, the alignment film 3 is formed by pre-baking after applying a dope.

As shown in FIG. 3, a plastic frame 6 is formed on the alignment film 3; specifically, the plastic frame 6 is obtained by a conventional molding process, for example, coating.

As shown in FIG. 3, the liquid crystal layer 2 is formed in the plastic frame 6. Specifically, the liquid crystal layer 2 is obtained by a conventional liquid crystal dropping method.

As shown in FIG. 4, the cover glass 5 is bonded to the liquid crystal layer 2; specifically, the cover glass 5 is bonded to the liquid crystal layer 2, and then cured by ultraviolet light.

The cover glass 5 is formed by plating a transparent electrode layer 4 between the cover glass 5 and the liquid crystal layer 2; specifically, the existing transparent electrode is used on the surface of the cover glass 5 opposite to the liquid crystal layer 2. The layer 4 is produced by, for example, a transparent electrode layer 4 is formed by vapor deposition; and the cover glass 5 is a transparent glass substrate or a resin substrate.

As shown in FIG. 4, on the side surface of the substrate 14 of the organic electroluminescence display panel 1 facing away from the alignment film 3 and the side surface of the cover glass 5 facing away from the transparent electrode layer 4, a polarizer 7 is attached, respectively. And the upper polarizer 8; the polarization directions of the lower polarizer 7 and the upper polarizer 8 are perpendicular to each other.

In the present invention, the fabrication of the organic electroluminescent display panel 1 generally includes:

As shown in FIG. 5, step one: providing a substrate 14. Here, the substrate 14 may be, for example, a transparent glass substrate or a resin substrate, but the present invention is not limited thereto.

Step 2: A buffer layer 141 is formed on the substrate 14. Further, as another embodiment of the present invention, step two may be omitted.

Step 3: A polysilicon layer 142 is formed on the buffer layer 141. As another embodiment of the present invention, when the second step is omitted, the polysilicon layer 142 is directly formed on the substrate 14. The polysilicon layer 142 is formed by specifically forming an amorphous silicon layer on the buffer layer 141 by plasma enhanced chemical vapor deposition (PECVD); then, recrystallizing the amorphous silicon layer by using excimer laser A polysilicon layer 142 is formed. In addition, the polysilicon layer 142 includes an undoped layer 1421, a heavily doped layer 1422 disposed on both sides of the undoped layer 1421, and a lightly doped layer 1423 disposed between the heavily doped layer 1422 and the undoped layer 1421. . Here, the lightly doped layer 1423 is an N-type lightly doped layer, and the heavily doped layer 1422 is an N-type heavily doped layer, but the invention is not limited thereto, for example, the lightly doped layer 1423 may also be a P-type lightly doped layer. The hetero-layer, heavily doped layer 1422 may also be a P-type heavily doped layer.

Step 4: A gate insulating layer 143 is formed on the polysilicon layer 142 and the buffer layer 141. When the second step is omitted, the gate insulating layer 143 is formed on the polysilicon layer 142 and the substrate 14.

Step 5: forming a gate 144 on the polysilicon layer 142 on the gate insulating layer 143.

Step 6: forming an interlayer insulating layer 145 on the gate electrode 144 and the gate insulating layer 143.

Step 7: A via hole is formed in the interlayer insulating layer 145 to form the interlayer insulating layer 145 and the gate insulating layer 143 to expose the heavily doped layer 1422, respectively.

Step 8: Forming a source 146 forming a filled via in contact with the corresponding heavily doped layer 1422 and a drain 147 filling the via in contact with the corresponding heavily doped layer 1422 are formed on the interlayer insulating layer 145.

Step 9: A flat layer 148 is formed on the interlayer insulating layer 145, the source 146, and the drain 147.

Step 10: A via is formed in the planarization layer 148 that exposes the drain 147.

The above steps 2 to 10 complete the fabrication process of the thin film transistor 15 according to the embodiment of the present invention. It should be noted that the above steps of fabricating the thin film transistor are adaptively adjusted according to thin film transistors having different structures.

Step 11: An anode 12 is formed on the planarization layer 148 to form a filled via to contact the exposed drain 147. The anode 12 is transparent.

Step 12: A pixel defining layer 149 is formed on the flat layer 148 and the anode 12.

Step 13: Forming a via hole in the pixel defining layer 149, the via hole exposing the anode 12.

Step 14: Forming an organic electroluminescent device 16 on the exposed anode 12. In the present embodiment, the organic electroluminescent device 16 includes, in order from the anode 12 to the cathode 13, a hole injection layer (HIL) 161, a hole transport layer (HTL) 162, an organic light emitting layer (EML) 163, and an electron transport layer. (ETL) 164 and electron injection layer (EIL) 165; however, the organic electroluminescent device 16 of the present invention is not limited to the structure herein.

Step 15: A cathode 13 is formed on the organic electroluminescent device 16. Here, the cathode 13 is light transmissive.

The anode 12 is made of an indium tin oxide semiconductor transparent conductive film or an indium zinc oxide semiconductor transparent conductive film; the cathode 13 is one of Mg or Ag.

Step 16: A package layer 11 is formed on the cathode 13 and the pixel defining layer 149.

The fabrication of the organic electroluminescent display panel 1 is finally completed.

The invention realizes the single-sided display function by controlling the voltage of the transparent electrode to make the liquid crystal layer deflect under the control of the cathode 13 and the transparent electrode layer 4. Here, the control of the transparent electrode can be performed by using the prior art. This is not specifically limited, and it is only necessary to ensure that a voltage is input to the transparent electrode.

While the invention has been shown and described with respect to the specific embodiments the embodiments of the invention Various changes in details.

Claims

A double-sided display comprising an organic electroluminescent display panel, wherein: an encapsulation layer of the organic electroluminescence display panel is provided with a liquid crystal layer, and a cover glass is disposed on the liquid crystal layer, the liquid crystal layer and the encapsulation layer An alignment film is disposed between the cover glass and the liquid crystal layer, and the voltage of the transparent electrode layer is controlled to control the deflection of the liquid crystal molecules of the liquid crystal layer to realize single or double-sided display.
The double-sided display according to claim 1, wherein the anode and the cathode of the organic electroluminescence display panel are made of a transparent conductive material.
The double-sided display according to claim 1, wherein the substrate of the organic electroluminescence display panel is provided with a lower polarizer on a side surface facing away from the alignment film and a side surface of the cover glass facing away from the transparent electrode layer. And upper polarizer.
The double-sided display according to claim 2, wherein: the substrate of the organic electroluminescent display panel is provided with a lower polarizer on a side surface facing away from the alignment film and a side surface of the cover glass facing away from the transparent electrode layer And upper polarizer.
The double-sided display according to claim 3, wherein polarization directions of said lower polarizer and upper polarizer are perpendicular to each other.
The double-sided display according to claim 4, wherein polarization directions of said lower polarizer and upper polarizer are perpendicular to each other.
The double-sided display according to claim 1, wherein a plastic frame is further disposed between the alignment film and the transparent electrode layer, and the liquid crystal layer is disposed in the plastic frame.
A method for manufacturing a double-sided display, comprising: the following steps:

Making an organic electroluminescent display panel;

Forming an alignment film on an encapsulation layer of the organic electroluminescence display panel;

Making a plastic frame on the alignment film;

Making a liquid crystal layer in the plastic frame;

Laminating the cover glass on the liquid crystal layer;

Providing a lower polarizer and an upper polarizer on a side surface of the substrate of the organic electroluminescence display panel facing away from the alignment film and a surface of the cover glass facing away from the transparent electrode layer;

A transparent electrode layer is plated between the cover glass and the liquid crystal layer.
The method of manufacturing a double-sided display according to claim 8, wherein the anode and the cathode of the organic electroluminescence display panel are made of a transparent conductive material when the organic electroluminescence display panel is fabricated.
The method of manufacturing a double-sided display according to claim 8, wherein the cover glass is bonded to the liquid crystal layer and then cured by ultraviolet light.
The method of manufacturing a double-sided display according to claim 9, wherein the cover glass is bonded to the liquid crystal layer and then cured by ultraviolet light.
The method of manufacturing a double-sided display according to claim 8, wherein the polarization directions of the lower polarizer and the upper polarizer are perpendicular to each other.
The method of manufacturing a double-sided display according to claim 9, wherein the polarization directions of the lower polarizer and the upper polarizer are perpendicular to each other.
The method of manufacturing a double-sided display according to claim 9, wherein the anode is made of an indium tin oxide semiconductor transparent conductive film or an indium zinc oxide semiconductor transparent conductive film; and the cathode is one of Mg or Ag.