Flexible OLED touch display screen

Abstract

The utility model relates to the technical field of touch display screens, in particular to a flexible OLED touch display screen. Comprising an In Cell structure or an On Cell structure; the In Cell structure sequentially comprises an optical film, a first hard coating, a CPI thin film or a UTG cover plate layer, OCA optical cement, a polaroid, a second hard coating, a packaging thin film, a touch control layer, a flexible circuit board, a control chip, an OLED device layer, a TFT thin film, a third hard coating and a protective film from top to bottom, wherein the flexible circuit board and the control chip are bound and conducted with the touch control layer. The touch layer of the On Cell structure is arranged above the packaging film, the second hard coating is arranged below the packaging film, and other structures are the same as the In Cell structure; by arranging the hard coating, the water-oxygen-resistant stability, the bending resistance, the scratch resistance, the wear resistance and the impact resistance of the display screen are remarkably improved.

Description

Technical Field

[0001] The present application relates to the technical field of touch display screens, and in particular to a flexible OLED touch display screen. Background Art

[0002] Currently, flexible OLED touchscreen displays are widely used in wearable electronics and curved display devices. These screens primarily use thin films (such as CPI, i.e., transparent polyimide film) or ultra-thin glass (UTG) instead of glass cover plates to achieve bending and folding functions. However, although flexible OLED touchscreen displays meet the demand for flexible displays, several technical issues still need to be addressed:

[0003] (1) Poor environmental stability

[0004] Since the self-luminous layer of the OLED touch display is made of organic materials, its environmental stability such as resistance to temperature, water vapor and moisture is poor, which can easily lead to degraded screen performance and shortened lifespan.

[0005] (2) Poor scratch and wear resistance

[0006] The cover materials of flexible OLED touch displays (such as CPI film and UTG) are prone to scratches and wear during long-term use and friction, affecting the display effect and user experience.

[0007] (3) Insufficient bending resistance and impact resistance

[0008] Although CPI film and UTG have certain flexibility, they are prone to fatigue cracks and breakage under repeated bending and impact, reducing the durability of the screen.

[0009] (4) Limited light transmittance

[0010] Traditional polyimide (PI) films have strong absorption in the visible light range due to the interaction of intermolecular and intramolecular charge transfer complexes (CTCs), resulting in insufficient light transmittance. Although CPI films have improved their light transmittance through improvements, there is still room for improvement.

[0011] To this end, the present application provides a flexible OLED touch display screen to improve the problems of poor environmental stability, poor scratch and wear resistance, insufficient bending resistance and impact resistance, and limited light transmittance of flexible displays. Utility Model Content

[0012] In order to overcome the shortcomings of the existing technology, the present application provides a flexible OLED touch display screen, which significantly improves the packaging reliability, water and oxygen stability, bending resistance, scratch and wear resistance and impact resistance of the display screen by providing a hard coating with high hardness, scratch resistance, wear resistance and good light transmittance on the flexible CPI or UTG cover layer, packaging film layer\OLED device layer and protective film layer of the InCell structure or OnCell structure.

[0013] The technical solution adopted by this application to solve its technical problems is:

[0014] A flexible OLED touch display screen, including an In Cell structure or an On Cell structure;

[0015] The In Cell structure includes a first hard coating layer, which is applied on a CPI film or a UTG cover layer, a polarizer is laminated below the CPI film or the UTG cover layer, a second hard coating layer is laminated below the polarizer, the second hard coating layer is applied on an encapsulation film, a touch layer is laminated below the encapsulation film, and an OLED device layer is laminated below the touch layer;

[0016] The On Cell structure includes a first hard coating layer, which is applied on top of a CPI film or a UTG cover layer. A polarizer is bonded to the bottom of the CPI film or the UTG cover layer. A touch layer is bonded to the bottom of the polarizer. An encapsulation film is bonded to the bottom of the touch layer. A second hard coating layer is applied to the bottom of the encapsulation film. An OLED device layer is bonded to the bottom of the second hard coating layer.

[0017] In some embodiments, the In Cell structure further includes an optical film laminated on the first hard coating layer;

[0018] The On Cell structure further includes an optical film laminated on the first hard coating layer.

[0019] In some embodiments, the In Cell structure further includes a TFT film, and the TFT film is laminated below the OLED device layer;

[0020] The On Cell structure further includes a TFT film, and the TFT film is laminated below the OLED device layer.

[0021] In some embodiments, the In Cell structure further includes a protective film, and the protective film is laminated below the TFT film;

[0022] The On Cell structure further includes a protective film, and the protective film is laminated under the TFT film.

[0023] In some embodiments, a third hard coating layer is further provided between the TFT film and the protective film;

[0024] In some embodiments, the In Cell structure further includes a flexible circuit board electrically connected to the touch layer, and a control chip is provided on the flexible circuit board;

[0025] The On Cell structure further includes a flexible circuit board electrically connected to the touch layer, and a control chip is provided on the flexible circuit board.

[0026] The first hard coating layer, the second hard coating layer, and the third hard coating layer are all adhesive;

[0027] In some embodiments, the thickness of the first hard coating layer, the second hard coating layer, and the third hard coating layer is 20-25 μm, the hardness is greater than 7H, and the light transmittance is greater than 90%.

[0028] In some embodiments, the optical film is one or more of an AG optical film, an AR optical film, and an AF optical film.

[0029] In some embodiments, the CPI film or UTG cover layer in the In Cell structure is bonded to a polarizer via an OCA optical adhesive;

[0030] The CPI film or UTG cover layer in the On Cell structure is bonded to the polarizer through OCA optical adhesive.

[0031] The beneficial effects of this application are:

[0032] Flexible OLED touchscreen displays can be categorized as In-Cell or On-Cell structures, depending on the location of the touchscreen layer. The flexible OLED touchscreen display described in this application significantly improves the display's packaging reliability, water and oxygen stability, bending resistance, scratch and wear resistance, and impact resistance by providing a hard coating with high hardness, scratch resistance, wear resistance, and good light transmittance on the flexible CPI or UTG cover layer, encapsulation film layer, OLED device layer, and protective film layer in either the In-Cell or On-Cell structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present application is further described below with reference to the accompanying drawings and examples.

[0034] Figure 1 This is a schematic diagram of the In Cell structure of the flexible OLED touch display screen of this application;

[0035] Figure 2 This is a schematic diagram of the On Cell structure of the flexible OLED touch display screen of this application;

[0036] Figure 3 This is a schematic diagram of the assembly of the In Cell structure of the flexible OLED touch display screen of this application;

[0037] Figure 4 This is a schematic diagram of the assembly of the On Cell structure of the flexible OLED touch display screen of this application;

[0038] Among them: 1. First hard coating layer; 2. CPI film; 3. UTG cover layer; 4. Polarizer; 5. Second hard coating layer; 6. Encapsulation film; 7. Touch layer; 8. OLED device layer; 9. Optical film; 10. TFT film; 11. Protective film; 12. Third hard coating layer; 13. Flexible circuit board; 14. OCA optical adhesive. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the concept, specific structure and technical effects of this application in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features created in this application can be combined interactively without conflicting with each other.

[0040] like Figure 1 and Figure 2 As shown, a flexible OLED touch display screen includes an In Cell structure and an On Cell structure;

[0041] The In Cell structure includes a first hard coating layer 1, which is applied on a CPI film 2 or a UTG cover layer 3. A polarizer 4 is laminated below the CPI film 2 or the UTG cover layer 3. A second hard coating layer 5 is laminated below the polarizer 4. The second hard coating layer 5 is applied on an encapsulation film 6. A touch layer 7 is laminated below the encapsulation film 6. An OLED device layer 8 is laminated below the touch layer 7.

[0042] The On Cell structure includes a first hard coating layer 1, which is applied on top of a CPI film 2 or a UTG cover layer 3. A polarizer 4 is bonded to the bottom of the CPI film 2 or the UTG cover layer 3. A touch layer 7 is bonded to the bottom of the polarizer 4. An encapsulation film 6 is bonded to the bottom of the touch layer 7. A second hard coating layer 5 is applied to the bottom of the encapsulation film 6. An OLED device layer 8 is bonded to the bottom of the second hard coating layer 5.

[0043] Because the self-luminous layer of the OLED touch screen is composed of organic materials, it has poor tolerance to environmental conditions such as temperature, water vapor, and moisture. This application applies a first hard coating layer on the CPI film or UTG cover layer, a second hard coating layer on the encapsulation film, and a third hard coating layer on the protective film. The coating layer is composed of POSS synthetic resin and has excellent water and oxidation resistance, thereby improving the environmental stability of the display screen and extending the service life of the product.

[0044] In the prior art, the surface materials of flexible OLED touch screens are prone to scratches and wear over long-term use. The first hard coating in this application uses a high-hardness material with a hardness greater than 7H, which effectively improves the display's scratch and wear resistance, protects the display surface, and reduces wear.

[0045] Flexible displays are prone to fatigue cracking and breakage during repeated bending and use. This application enhances the material's bending and impact resistance by providing a hard coating on the CPI film or UTG cover layer. In addition, the encapsulation film is made of BOPET (biaxially oriented polyester film) and a second hard coating is applied on the encapsulation film, which has good rigidity and light transmittance, further enhancing the packaging reliability and impact resistance of the overall structure.

[0046] The high hardness of the hard coating significantly improves the durability of the display, reducing damage caused by friction and contact during daily use, and enhancing the user experience. Through structural design and material selection, the display can withstand greater physical deformation without damage, making it suitable for applications such as wearable devices and curved screens that require frequent bending.

[0047] In some embodiments, the In Cell structure further includes an optical film 9 bonded to the first hard coating layer 1 ; the On Cell structure further includes an optical film 9 bonded to the first hard coating layer 1 .

[0048] Specifically, the optical film 9 is one or more of AG optical film 9 , AR optical film 9 , and AF optical film 9 .

[0049] Optical films usually have AG (anti-glare) and AR (anti-reflection) properties. By laminating an optical film on the first hard coating, the glare and reflection problems of the screen in a strong light environment can be significantly reduced, and the visibility of the screen under different lighting conditions can be improved. When the optical film has AF (anti-fingerprint) function, it can reduce the adhesion of fingerprints and oil stains on the screen, keep the screen clean, and enhance the user experience. The optical film also plays a role in protecting the hard coating, preventing the hard coating from being directly exposed to the outside and damaged. At the same time, it also provides an additional protective layer for the surface of the display, reducing scratches and wear that may be caused by direct contact.

[0050] In some embodiments, the In Cell structure further includes a TFT film 10 , and the TFT film 10 is laminated below the OLED device layer 8 ;

[0051] The On Cell structure further includes a TFT film 10 , and the TFT film 10 is laminated below the OLED device layer 8 .

[0052] In this application, the addition of the TFT film provides better current control and protection for the OLED device layer, reduces damage to the display screen due to unstable current, and improves the stability and reliability of the entire display screen.

[0053] In some embodiments, the In Cell structure further includes a protective film 11 , and the protective film 11 is laminated under the TFT film 10 ;

[0054] The On Cell structure further includes a protective film 11 , and the protective film 11 is laminated under the TFT film 10 .

[0055] In this application, the use of a protective film can slow the aging process of display components, especially under frequent use or harsh environments, helping to extend the life of the display. During the manufacturing and assembly process of the display, components may be accidentally damaged. The protective film provides a protective layer for the TFT thin film, reducing damage that may occur during the manufacturing process.

[0056] In some embodiments, a third hard coating layer 12 is disposed between the TFT film 10 and the protective film 11 .

[0057] In this application, the display may be subject to accidental impact during use. The addition of the third hard coating provides an additional impact-resistant layer, helping to disperse and absorb impact forces and reduce damage. For flexible displays, bending resistance is crucial, and the addition of the third hard coating enhances the structural stability of the display during repeated bending.

[0058] In some embodiments, the In Cell structure further includes a flexible circuit board (FPC) 13 electrically connected to the touch layer 7;

[0059] The On Cell structure further includes a flexible circuit board 13 electrically connected to the touch layer 7 .

[0060] In this application, the use of a flexible circuit board allows for a more flexible connection between the touch layer and the display control card, adapting to various bending and folding forms while maintaining the stability of the electrical connection.

[0061] Specifically, the first hard coating layer, the second hard coating layer, and the third hard coating layer are all adhesive;

[0062] In some embodiments, the first hard coating layer 1 , the second hard coating layer 5 , and the third hard coating layer 12 have a thickness of 20-25 μm, a hardness greater than 7H, and a light transmittance greater than 90%.

[0063] In some embodiments, the CPI film 2 or UTG cover layer 3 in the In Cell structure is bonded to the polarizer 4 via an OCA optical adhesive 14;

[0064] The CPI film 2 or UTG cover layer 3 in the On Cell structure is bonded to the polarizer 4 via OCA optical adhesive 14 .

[0065] Specifically, the use of OCA optical adhesive 14 provides strong adhesion, ensuring a firm fit between the CPI film or UTG cover layer and the polarizer.

[0066] like Figure 3 As shown in the figure, during the assembly process of the In Cell structure, each structure is assembled according to the following order and connection relationship:

[0067] CPI film or UTG cover layer: First place the CPI film or UTG cover layer as the cover.

[0068] First Hard Coating: A first hard coating is then applied to the first side (usually the user-facing side) of the CPI film or UTG cover layer. This layer primarily enhances the display's water and oxygen resistance, bending resistance, scratch and abrasion resistance, and impact resistance.

[0069] Polarizer: The polarizer is then bonded to the underside of the CPI film or UTG cover layer using OCA optical adhesive. Polarizers control the direction of light transmission, improving the contrast and clarity of the screen display.

[0070] Second hard coating: A second hard coating is applied below the polarizer and above the encapsulation film. This layer also enhances the display's hardness and bending resistance, and serves as a bond between the polarizer and the encapsulation film.

[0071] Encapsulation film: Located below the second hard coating layer, the second hard coating layer is applied on top of the encapsulation film. The encapsulation film is used to protect the internal electronic components and display screen from being affected by the external environment.

[0072] Touch layer: The touch layer is laminated under the encapsulation film. The touch layer is the key part for users to perform touch operations, and it can convert touch signals into electrical signals for processing.

[0073] OLED device layer: Finally, the OLED device layer is laminated under the touch layer. The OLED device layer is the self-luminous layer responsible for producing images and colors.

[0074] Other optional structures: Depending on the specific design, the In Cell structure can also include TFT thin film, a third hard coating, a protective film, and a flexible circuit board. These structures further enhance the performance and stability of the display.

[0075] TFT (Thin Film Transistor) film: laminated underneath the OLED device layer to provide better current control and protection.

[0076] Protective film: It is attached under the TFT film to slow down the aging process of the display assembly.

[0077] The third hard coating layer is applied under the protective film to further increase the impact resistance and bending resistance of the display.

[0078] Flexible printed circuit (FPC): electrically connected to the touch layer, allowing communication between the touch layer and the display control card. A control chip is provided on the flexible printed circuit board.

[0079] like Figure 4 As shown in the figure, the assembly process of the On Cell structure is similar to that of the In Cell structure, but the positions of the touch layer and the encapsulation film are different:

[0080] CPI film or UTG cover layer: also used as cover material.

[0081] First hard coating: A first hard coating is applied on the CPI film or the UTG cover layer.

[0082] Polarizer: Use OCA optical adhesive to bond the polarizer to the bottom of the CPI film or UTG cover layer.

[0083] Touch layer: Directly attached to the bottom of the polarizer, the touch layer is placed above the encapsulation film. This is one of the main differences from the In Cell structure, where the touch layer is located above the encapsulation film.

[0084] Encapsulation film: A film is laminated underneath the touch screen layer to protect the underlying electronic components and display.

[0085] Second hard coating: A second hard coating is laminated below the packaging film.

[0086] OLED device layer: The OLED device layer is laminated and disposed below the second hard coating layer.

[0087] Other optional structures: can also include TFT film, third hard coating, protective film, flexible circuit board and control chip according to design requirements.

[0088] The functions and positional relationships of the TFT film, the third hard coating, the protective film, and the flexible circuit board are the same as those described in the In Cell structure.

[0089] The above is a specific description of the preferred implementation of the present application, but the invention of the present application is not limited to the described embodiments. Technical personnel familiar with the art can also make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A flexible OLED touch display screen, characterized in that: Including In Cell structure or On Cell structure; The In Cell structure comprises a first hard coating layer (1), wherein the first hard coating layer (1) is applied on a CPI film (2) or a UTG cover layer (3), a polarizer (4) is laminated below the CPI film (2) or the UTG cover layer (3), a second hard coating layer (5) is laminated below the polarizer (4), the second hard coating layer (5) is applied on an encapsulation film (6), a touch layer (7) is laminated below the encapsulation film (6), and an OLED device layer (8) is laminated below the touch layer (7); The On Cell structure comprises a first hard coating layer (1), wherein the first hard coating layer (1) is applied on a CPI film (2) or a UTG cover layer (3), a polarizer (4) is laminated below the CPI film (2) or the UTG cover layer (3), a touch layer (7) is laminated below the polarizer (4), an encapsulation film (6) is laminated below the touch layer (7), a second hard coating layer (5) is applied below the encapsulation film (6), and an OLED device layer (8) is laminated below the second hard coating layer (5).

2. The flexible OLED touch display screen according to claim 1, characterized in that: The In Cell structure further includes an optical film (9) laminated on the first hard coating layer (1); The On Cell structure further includes an optical film (9) laminated on the first hard coating layer (1).

3. The flexible OLED touch display screen according to claim 1, characterized in that: The In Cell structure further includes a TFT film (10), and the TFT film (10) is laminated below the OLED device layer (8); The On Cell structure further includes a TFT film (10), and the TFT film (10) is laminated below the OLED device layer (8).

4. The flexible OLED touch display screen according to claim 3, characterized in that: The In Cell structure further includes a protective film (11), and the protective film (11) is laminated below the TFT film (10); The On Cell structure further comprises a protective film (11), and the protective film (11) is laminated and arranged below the TFT film (10).

5. The flexible OLED touch display screen according to claim 4, characterized in that: A third hard coating layer (12) is also provided between the TFT film (10) and the protective film (11).

6. The flexible OLED touch display screen according to claim 5, characterized in that: The In Cell structure further includes a flexible circuit board (13) electrically connected to the touch layer (7); The On Cell structure further includes a flexible circuit board (13) electrically connected to the touch layer (7).

7. The flexible OLED touch display screen according to claim 5, characterized in that: The thickness of the first hard coating layer (1), the second hard coating layer (5), and the third hard coating layer (12) is 20-25 μm.

8. The flexible OLED touch display screen according to claim 5, characterized in that: The hardness of the first hard coating layer (1), the second hard coating layer (5), and the third hard coating layer (12) is greater than 7H, and the light transmittance is greater than 90%.

9. The flexible OLED touch display screen according to claim 2, characterized in that: The optical film (9) is one of an AG optical film (9), an AR optical film (9), and an AF optical film (9).

10. The flexible OLED touch display screen according to claim 1, characterized in that: The CPI film (2) or UTG cover layer (3) in the In Cell structure is bonded to a polarizer (4) via OCA optical adhesive; The CPI film (2) or UTG cover layer (3) in the On Cell structure is bonded to a polarizer (4) via OCA optical adhesive.

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