WO2021164169A1

WO2021164169A1 - Foldable amoled display screen structure and manufacturing method

Info

Publication number: WO2021164169A1
Application number: PCT/CN2020/098491
Authority: WO
Inventors: 赖耀升; 江建志
Original assignee: 恩利克（浙江）智能装备有限公司
Priority date: 2020-02-18
Filing date: 2020-06-28
Publication date: 2021-08-26
Also published as: CN111176490A

Abstract

Disclosed in the present invention is a foldable AMOLED display screen structure. The foldable AMOLED display screen structure sequentially comprises, from bottom to top, a PI substrate, a circuit driving layer and an OLED layer, a multi-layer thin-film encapsulation layer is arranged above the OLED layer, an ultra-thin glass layer is attached to the upper portion of the multi-layer thin-film encapsulation layer, a touch-control sensor layer is plated on the upper portion of the ultra-thin glass layer, a circular polarizer is attached to the upper portion of the touch-control sensor layer, PET is attached to the upper portion of the circular polarizer, and a hardened anti-fouling film is arranged on the upper surface of the PET, or the circular polarizer is arranged below the ultra-thin glass layer. Ultra-thin glass is used as a protective layer to protect the flexible AMOLED, no creases are present during bending, the whole body is thinner, bending is facilitated, in addition, the touch-control sensor is located on the ultra-thin glass, and the yield during production is higher.

Description

Structure and manufacturing method of a foldable AMOLED display

Technical field

The invention belongs to the field of OLED display screens, and more specifically relates to a structure and manufacturing method of a foldable AMOLED display screen.

Background technique

Since the beginning of 2019, companies including BOE have successively exposed fully self-developed foldable self-luminous flexible screens. According to Internet news, Samsung, Huawei, and other companies have also made related products. China Unicom even stated in its official Weibo that "folding screen phones are not far away!"

At present, there are many problems in the folding screen phones released on the market. For example, Samsung's Galaxy Fold, just after the test machine was released, there were various problems on the screen.

In addition to the flexible OLED display panel that must be foldable for folding screen mobile phones, in the entire mobile phone display, there are some other functional layers between the glass cover and the panel layer, such as polarizers, touch screens, etc. The thicker the thickness of all functional layers, the more Not conducive to folding. There are currently two types of folding OLED display panel structures on the market. One is Samsung’s approach. The PI substrate is plated with a circuit driver (LTPS-TFT), then an OLED layer (RGB-OLED) is plated, and the other is a multilayer thin film package ( TFE), then touch sensor, then OCA pasted with circular polarizer, then OCA pasted with plastic cover (CPI), coated with hard coating (Hard Coat), and then OCA pasted with PET, coated with hardening + anti-fouling Film; the second type has several layers more than the first type. The circuit driver (LTPS-TFT) is plated on the PI substrate, and then the OLED layer (RGB-OLED) is plated, then the multilayer thin film encapsulation (TFE), and then OCA Paste PET, there is a touch sensor on it, then OCA is pasted with a circular polarizer, then OCA is pasted on a plastic cover (CPI), which is coated with a hardened film, and then OCA is pasted on PET, which is coated with a hardened anti-fouling film.

For the first Samsung solution, the main disadvantage is that after the CPI as the protective layer of the OLED layer is added with a hardened film, although it can be bent, it will produce creases after bending, which is very unfavorable for folding screens. For the second solution, because an additional layer of PET is added and an additional layer of OCA is required, the thickness increases a lot, and CPI is also used, which will cause creases.

Summary of the invention

In view of the shortcomings of the prior art, the present invention provides a flexible AMOLED that uses ultra-thin glass as a protective layer to protect the flexible AMOLED, which has no creases during bending, and is thinner as a whole, which is conducive to bending. At the same time, the touch sensor is located on the ultra-thin glass. , The yield rate is higher during production.

In order to achieve the above objectives, the present invention provides the following technical solutions: a structure of a foldable AMOLED display screen, which includes a PI substrate, a circuit drive layer, and an OLED layer from bottom to top, and a multilayer thin film encapsulation layer is arranged above the OLED layer. An ultra-thin glass layer is attached above the multi-layer film encapsulation layer, a touch sensor layer is plated on the ultra-thin glass layer, a circular polarizer is attached above the touch sensor layer, and PET and PET are attached above the circular polarizer. The upper surface is provided with a hardened anti-fouling film.

It further includes a first optical adhesive layer, a second optical adhesive layer, and a third optical adhesive layer. The ultra-thin glass layer and the multilayer film encapsulation layer are bonded through the first optical adhesive layer, and the circular polarizer is connected to the touch sensor. The layers are bonded through the second optical adhesive layer, and the PET and the circular polarizer are bonded through the third optical adhesive layer.

Further, the thickness of the PI substrate is 10-20 microns, the thickness of the multilayer film encapsulation layer is 10-20 microns, and the thickness of the first optical adhesive layer, the second optical adhesive layer and the third optical adhesive layer are all 30- 60 microns, the thickness of the ultra-thin glass layer is 30-100 microns, the thickness of the circular polarizer is 100-150 microns, and the thickness of PET is 80-150 microns.

Further, the first optical adhesive layer, the second optical adhesive layer and the third optical adhesive layer are OCR optical adhesive or OCA optical adhesive.

A structure of a foldable AMOLED display screen, which includes a PI substrate, a circuit drive layer, and an OLED layer in order from bottom to top. A multilayer thin film encapsulation layer is arranged above the OLED layer, and a circular polarizer is attached to the top of the multilayer thin film encapsulation layer. An ultra-thin glass layer is attached above the circular polarizer, a touch sensor layer is plated on the ultra-thin glass layer, PET is attached above the touch sensor layer, and the upper surface of the PET is provided with a hardened anti-fouling film.

A manufacturing method of a foldable AMOLED display screen includes the following steps:

S1: LTPS-TFT circuit is plated on the PI substrate to form a circuit drive layer. The thickness of the PI substrate is 10-20 microns;

S2: vapor-deposit OLED on the LTPS-TFT circuit to form an OLED layer;

S3: The OLED is encapsulated by a multilayer film to form a multilayer film encapsulation layer, the thickness of the multilayer film encapsulation is 10-20 microns;

S4: Use optical glue to laminate ultra-thin glass on the multilayer film package to form an ultra-thin glass layer. The thickness of the optical glue is 30-60 microns, and the thickness of the ultra-thin glass is 30-100 microns;

S5: Plating a touch sensor on the upper surface of the ultra-thin glass to form a touch sensor layer;

S6: The optical glue is used to bond the circular polarizer on the upper surface of the touch sensor, the thickness of the optical glue is 30-60 microns, and the thickness of the circular polarizer is 100-150 microns;

S7: Use optical glue to laminate PET on the upper surface of the circular polarizer, the thickness of the optical glue is 30-60 microns, and the thickness of PET is 80-150 microns;

S8: Coating a hardened anti-fouling film on the surface of PET.

S2: vapor-deposit OLED on the LTPS-TFT circuit to form an OLED layer;

S4: Plating a touch sensor on the upper surface of the ultra-thin glass to form a touch sensor layer;

S5: Use optical glue to laminate ultra-thin glass with touch sensor on the multilayer film package. The touch sensor layer is located above to form an ultra-thin glass layer. The thickness of the optical glue is 30-60 microns, the thickness of the ultra-thin glass 30-100 microns;

S8: Coating a hardened anti-fouling film on the surface of PET.

S2: vapor-deposit OLED on the LTPS-TFT circuit to form an OLED layer;

S4: The optical glue is used to bond the circular polarizer on the upper surface of the multilayer film package, the thickness of the optical glue is 30-60 microns, and the thickness of the circular polarizer is 100-150 microns;

S5: Use optical glue to glue ultra-thin glass on the circular polarizer to form an ultra-thin glass layer. The thickness of the optical glue is 30-60 microns, and the thickness of the ultra-thin glass is 30-100 microns;

S6: Plating a touch sensor on the upper surface of the ultra-thin glass to form a touch sensor layer;

S7: Use optical glue to laminate PET on the upper surface of the touch sensor. The thickness of the optical glue is 30-60 microns, and the thickness of PET is 80-150 microns;

S8: Coating a hardened anti-fouling film on the surface of PET.

S2: vapor-deposit OLED on the LTPS-TFT circuit to form an OLED layer;

S6: Use optical glue to laminate ultra-thin glass with a touch sensor layer on the circular polarizer. The touch sensor layer is located above to form an ultra-thin glass layer. The thickness of the optical glue is 30-60 microns, and the thickness of the ultra-thin glass is 30-100 microns;

S8: Coating a hardened anti-fouling film on the surface of PET.

Compared with the prior art, the beneficial effects of the present invention are:

1. The present invention eliminates the CPI and hardened film, and uses ultra-thin glass to make the flexible OLED have better overall folding recovery without leaving creases; compared with the second solution of the prior art, the present invention also eliminates A layer of PET; the present invention not only has excellent folding recovery without leaving creases, but also reduces the overall thickness of the flexible OLED display panel. The thinnest thickness can be about 350 microns, making the folding angle smaller and folding Better results;

2. The protection effect of the OLED layer is better through the ultra-thin glass, and then the ultra-thin glass is protected by PET and optical glue to make the ultra-thin glass not easy to break;

3. The touch sensor is made on the ultra-thin glass and then bonded with the flexible AMOLED to increase the yield.

Description of the drawings

FIG. 1 is the first structure of a folded OLED display panel in the prior art;

FIG. 2 is a structure of a second foldable OLED display panel in the prior art;

Figure 3 is a schematic structural diagram of Embodiment 1 of the present invention;

Fig. 4 is a schematic structural diagram of the second embodiment of the present invention.

Reference signs: 1. PI substrate; 2. circuit drive layer; 3. OLED layer; 4. multilayer thin film encapsulation layer; 5. first optical adhesive layer; 6. ultra-thin glass layer; 7. touch sensor layer; 8. Second optical adhesive layer; 9. Circular polarizer; 10. Third optical adhesive layer; 11. PET; 12. Hardened anti-fouling film.

Detailed ways

In the description of the present invention, it should be noted that for orientation words, if there are the terms "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", " "Width", "Thickness", "Top", "Bottom", "Front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner" "," "outside", "clockwise", "counterclockwise" and other indicating orientations and positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that The device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be construed as limiting the specific protection scope of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features may explicitly or implicitly include one or more of these features. In the description of the present invention, "several" and "several" mean two or two Above, unless otherwise specifically defined.

Example one:

As shown in Figure 3, a structure of a foldable AMOLED display screen includes a PI substrate 1, a circuit drive layer 2, an OLED layer 3 from bottom to top, and a multilayer thin film encapsulation layer 4 is arranged above the OLED layer 3. An ultra-thin glass layer 6 is attached above the multilayer film encapsulation layer, a touch sensor layer 7 is plated above the ultra-thin glass layer 6, a circular polarizer 9 is attached above the touch sensor layer 7, and a circular polarizer 9 is attached above the circular polarizer PET11, PET11 is provided with a hardened anti-fouling film 12 on the upper surface.

In this embodiment, the circuit driving layer is a TFT made of LTPS, the OLED layer is RGB_OLED, and the TFT and the OLED form an AMOLED.

This embodiment preferably further includes a first optical adhesive layer 5, a second optical adhesive layer 8 and a third optical adhesive layer 10. The ultra-thin glass layer and the multi-layer film encapsulation layer are bonded together through the first optical adhesive layer, The polarizer and the touch sensor layer are bonded through the second optical adhesive layer, and the PET and the circular polarizer are bonded through the third optical adhesive layer.

The thickness of the PI substrate is 10-20 microns, the thickness of the multilayer film encapsulation layer is 10-20 microns, and the thickness of the first optical adhesive layer, the second optical adhesive layer and the third optical adhesive layer are all 30-60 Micron, the thickness of the ultra-thin glass layer is 30-100 microns, the thickness of the circular polarizer is 100-150 microns, and the thickness of PET is 80-150 microns.

The first optical adhesive layer, the second optical adhesive layer and the third optical adhesive layer are OCR optical adhesive or OCA optical adhesive.

In the present invention, the plastic cover plate and the hardened film that can produce creases are omitted, and the ultra-thin glass is used as the protective structure to protect the OLED. At the same time, the touch sensor is made on the ultra-thin glass and then bonded with the flexible AMOLED, which improves the yield.

Method 1 of manufacturing embodiment 1: A manufacturing method of a foldable AMOLED display screen includes the following steps:

S2: vapor-deposit OLED on the LTPS-TFT circuit to form an OLED layer;

S8: Coating a hardened anti-fouling film on the surface of PET.

This method is one method, and the second method can also be used to make the first embodiment. The difference from the first method is that before the ultra-thin glass is laminated on the multilayer film package, the upper surface of the ultra-thin glass is coated The control sensor is formed into an ultra-thin glass with a touch sensor layer, and then the entire ultra-thin glass with a touch sensor is bonded to the surface of the multilayer film package through optical glue, and the remaining steps are the same as the method one.

Embodiment two:

As shown in Figure 4, a structure of a foldable AMOLED display screen includes a PI substrate 1, a circuit drive layer 2, an OLED layer 3 from bottom to top. A circular polarizer 9 is attached above the multilayer film encapsulation layer 4, an ultra-thin glass layer 6 is attached above the circular polarizer 9, and a touch sensor layer 7 is plated on the ultra-thin glass layer 6, a touch sensor A PET11 is attached to the upper surface of the layer 7, and a hardened anti-fouling film 12 is provided on the upper surface of the PET.

In this embodiment, the first optical adhesive layer 5 is used for bonding the circular polarizer and the multilayer film packaging layer; the second optical adhesive layer 8 is used for bonding the circular polarizer and the ultra-thin glass layer; the third optical adhesive layer 10 Used for bonding PET and touch sensor layer.

Method 1 of manufacturing embodiment 2: A manufacturing method of a foldable AMOLED display screen includes the following steps:

S2: vapor-deposit OLED on the LTPS-TFT circuit to form an OLED layer;

S8: Coating a hardened anti-fouling film on the surface of PET.

This method is one method, and the second method can also be used to make the second embodiment. The difference from the first method is that before bonding the ultra-thin glass to the circular polarizer, the touch sensor is plated on the upper surface of the ultra-thin glass. , Forming an ultra-thin glass with a touch sensor layer, and then bonding the entire ultra-thin glass with a touch sensor to the surface of the circular polarizer through optical glue, and the remaining steps are the same as method one.

The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments. All technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and modifications made without departing from the principle of the present invention, these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

A structure of a foldable AMOLED display screen, which includes a PI substrate, a circuit drive layer, and an OLED layer from bottom to top. A multilayer thin film encapsulation layer is arranged above the OLED layer, and is characterized in that: There is an ultra-thin glass layer, a touch sensor layer is plated on the ultra-thin glass layer, a circular polarizer is pasted on the top of the touch sensor layer, and PET is pasted on the top of the circular polarizer, and the upper surface of the PET is provided with a hardened anti-fouling film.
The structure of the foldable AMOLED display screen according to claim 1, characterized in that it further comprises a first optical adhesive layer, a second optical adhesive layer and a third optical adhesive layer, one of the ultra-thin glass layer and the multilayer film encapsulation layer They are bonded through the first optical adhesive layer, the circular polarizer and the touch sensor layer are bonded through the second optical adhesive layer, and the PET and the circular polarizer are bonded through the third optical adhesive layer.
The structure of the foldable AMOLED display screen according to claim 2, wherein the thickness of the PI substrate is 10-20 microns, the thickness of the multilayer film encapsulation layer is 10-20 microns, and the first optical adhesive layer, The thickness of the second optical adhesive layer and the third optical adhesive layer are both 30-60 microns, the thickness of the ultra-thin glass layer is 30-100 microns, the thickness of the circular polarizer is 100-150 microns, and the thickness of PET is 80-150 Micrometers.
The structure of the foldable AMOLED display screen according to claim 3, wherein the first optical adhesive layer, the second optical adhesive layer and the third optical adhesive layer are OCR optical adhesive or OCA optical adhesive.
A structure of a foldable AMOLED display screen, which includes a PI substrate, a circuit drive layer, and an OLED layer from bottom to top. A multilayer thin film encapsulation layer is arranged above the OLED layer, and is characterized in that: A circular polarizer is attached, an ultra-thin glass layer is attached above the circular polarizer, a touch sensor layer is plated on the ultra-thin glass layer, PET is attached above the touch sensor layer, and the upper surface of the PET is provided with a hardening Anti-fouling film.
A method for manufacturing a foldable AMOLED display screen according to claim 1, characterized in that it comprises the following steps:

S1: LTPS-TFT circuit is plated on the PI substrate to form a circuit drive layer. The thickness of the PI substrate is 10-20 microns;

S2: vapor-deposit OLED on the LTPS-TFT circuit to form an OLED layer;

S3: The OLED is encapsulated by a multilayer film to form a multilayer film encapsulation layer, the thickness of the multilayer film encapsulation is 10-20 microns;

S4: Use optical glue to laminate ultra-thin glass on the multilayer film package to form an ultra-thin glass layer. The thickness of the optical glue is 30-60 microns, and the thickness of the ultra-thin glass is 30-100 microns;

S5: Plating a touch sensor on the upper surface of the ultra-thin glass to form a touch sensor layer;

S6: The optical glue is used to bond the circular polarizer on the upper surface of the touch sensor, the thickness of the optical glue is 30-60 microns, and the thickness of the circular polarizer is 100-150 microns;

S7: Use optical glue to laminate PET on the upper surface of the circular polarizer, the thickness of the optical glue is 30-60 microns, and the thickness of PET is 80-150 microns;

S8: Coating a hardened anti-fouling film on the surface of PET.
A method for manufacturing a foldable AMOLED display screen according to claim 1, characterized in that it comprises the following steps:

S1: LTPS-TFT circuit is plated on the PI substrate to form a circuit drive layer. The thickness of the PI substrate is 10-20 microns;

S2: vapor-deposit OLED on the LTPS-TFT circuit to form an OLED layer;

S3: The OLED is encapsulated by a multilayer film to form a multilayer film encapsulation layer, the thickness of the multilayer film encapsulation is 10-20 microns;

S4: Plating a touch sensor on the upper surface of the ultra-thin glass to form a touch sensor layer;

S5: Use optical glue to laminate ultra-thin glass with touch sensor on the multilayer film package. The touch sensor layer is located above to form an ultra-thin glass layer. The thickness of the optical glue is 30-60 microns, the thickness of the ultra-thin glass 30-100 microns;

S6: The optical glue is used to bond the circular polarizer on the upper surface of the touch sensor, the thickness of the optical glue is 30-60 microns, and the thickness of the circular polarizer is 100-150 microns;

S7: Use optical glue to laminate PET on the upper surface of the circular polarizer, the thickness of the optical glue is 30-60 microns, and the thickness of PET is 80-150 microns;

S8: Coating a hardened anti-fouling film on the surface of PET.
A method for manufacturing a foldable AMOLED display screen according to claim 5, characterized in that it comprises the following steps:

S1: LTPS-TFT circuit is plated on the PI substrate to form a circuit drive layer. The thickness of the PI substrate is 10-20 microns;

S2: vapor-deposit OLED on the LTPS-TFT circuit to form an OLED layer;

S3: The OLED is encapsulated by a multilayer film to form a multilayer film encapsulation layer, the thickness of the multilayer film encapsulation is 10-20 microns;

S4: The optical glue is used to bond the circular polarizer on the upper surface of the multilayer film package, the thickness of the optical glue is 30-60 microns, and the thickness of the circular polarizer is 100-150 microns;

S5: Use optical glue to glue ultra-thin glass on the circular polarizer to form an ultra-thin glass layer. The thickness of the optical glue is 30-60 microns, and the thickness of the ultra-thin glass is 30-100 microns;

S6: Plating a touch sensor on the upper surface of the ultra-thin glass to form a touch sensor layer;

S7: Use optical glue to laminate PET on the upper surface of the touch sensor. The thickness of the optical glue is 30-60 microns, and the thickness of PET is 80-150 microns;

S8: Coating a hardened anti-fouling film on the surface of PET.
A method for manufacturing a foldable AMOLED display screen according to claim 5, characterized in that it comprises the following steps:

S1: LTPS-TFT circuit is plated on the PI substrate to form a circuit drive layer. The thickness of the PI substrate is 10-20 microns;

S2: vapor-deposit OLED on the LTPS-TFT circuit to form an OLED layer;

S3: The OLED is encapsulated by a multilayer film to form a multilayer film encapsulation layer, and the thickness of the multilayer film encapsulation is 10-20 microns;

S4: The optical glue is used to bond the circular polarizer on the upper surface of the multilayer film package, the thickness of the optical glue is 30-60 microns, and the thickness of the circular polarizer is 100-150 microns;

S5: Plating a touch sensor on the upper surface of the ultra-thin glass to form a touch sensor layer;

S6: Use optical glue to laminate ultra-thin glass with a touch sensor layer on the circular polarizer. The touch sensor layer is located above to form an ultra-thin glass layer. The thickness of the optical glue is 30-60 microns, and the thickness of the ultra-thin glass is 30-100 microns;

S7: Use optical glue to laminate PET on the upper surface of the touch sensor. The thickness of the optical glue is 30-60 microns, and the thickness of PET is 80-150 microns;

S8: Coating a hardened anti-fouling film on the surface of PET.