Black oca adhesive tape without substrate and display screen

Abstract

The utility model relates to a kind of no-substrate black OCA adhesive tape and display screen, the no-substrate black OCA adhesive tape is composed of light release film, black OCA gelatin and heavy release film by sequentially laminating, the black OCA gelatin is homogeneous and not layered gelatin, the visible light transmittance of the black OCA gelatin is 40±5%, and the haze is 40±5%;The thickness of the light release film is less than the thickness of the heavy release film, and the thickness of the heavy release film is less than the thickness of the black OCA gelatin.The no-substrate black OCA adhesive tape can make appearance color close to black screen outer frame in screen-off state, and also meet full-pasting filling requirements.

Description

Technical Field

[0001] This utility model relates to the field of adhesive tape, specifically to a substrate-free black OCA adhesive tape and a display screen. Background Technology

[0002] With the continuous expansion of large-size fully laminated displays, different scenarios have different requirements for display and appearance. For example, a black outer frame is a commonly used display frame. Fully laminated displays can be bonded using optically clear adhesive (OCA). Existing OCA tapes typically have a light transmittance of 15%~85% and a haze of 1%~30%. When the screen is off, there is a difference in color and opacity between the OCA tape and the outer frame. How to make the appearance of the display closely resemble the color of the outer frame when the screen is off is a current problem faced by tapes used for fully laminated displays. Moreover, most of the black adhesives currently used in the industry are bonding materials directly coated onto PET substrates, which do not meet the filling requirements for full lamination and are prone to air bubbles during the manufacturing process or after aging. Some OCA tapes currently use multi-layer adhesives. Multi-layer coatings are prone to delamination, and the differences in hardness between the multiple layers of adhesive lead to asynchronous deformation of the adhesive, which also easily causes air bubbles. In addition, existing tapes are all produced by one-time complete light curing or segmented curing, resulting in high initial tack and difficulty in removing adhesive during the manufacturing process, thus lacking reworkability. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the first objective of this utility model is to provide a substrate-free black OCA tape that can make the appearance close to the black screen frame when the screen is off, and can also meet the requirements of full-coverage filling.

[0004] The second objective of this invention is to provide a display screen bonded using the OCA tape.

[0005] To achieve the primary objective of this invention, a substrate-free black OCA tape is provided, comprising a light release film, a black OCA colloid, and a heavy release film stacked sequentially. The black OCA colloid is a uniform, non-layered colloid with a visible light transmittance of 40±5% and a haze of 40±5%. The thickness of the light release film is less than the thickness of the heavy release film, and the thickness of the heavy release film is less than the thickness of the black OCA colloid. The thickness of the black OCA colloid is greater than 100 μm.

[0006] In some embodiments of this invention, the thickness of the black OCA colloid is 150~250μm.

[0007] In some embodiments of this invention, the black OCA colloid is made of acrylic adhesive.

[0008] In some embodiments of this utility model, the acrylic adhesive of the black OCA colloid undergoes one UV curing, and the black OCA colloid is not completely cured after the first UV curing.

[0009] In some embodiments of this utility model, the thickness of the light release film is 50-75 μm, and the thickness of the heavy release film is 75-100 μm.

[0010] In some embodiments of this utility model, the light release film and the heavy release film are respectively made of PET material.

[0011] To achieve the second objective of this utility model, this utility model provides a display screen, which includes LEDs, black OCA colloid, PET layer and AG / HC film layer stacked in sequence. The black OCA colloid is a uniform non-layered colloid, and the visible light transmittance of the black OCA colloid is 40±5%, and the haze is 40±5%.

[0012] In some embodiments of this invention, the thickness of the black OCA colloid is 150~250μm.

[0013] In some embodiments of this invention, the black OCA colloid is made of acrylic adhesive.

[0014] In some embodiments of this utility model, the black OCA colloid is bonded to the LED and then cured twice.

[0015] In some embodiments of this utility model, the LED includes a PCB board and an LED chip disposed on the PCB board, and the black OCA colloid covers the LED chip.

[0016] In some embodiments of this invention, the thickness of the PET layer is 40~80μm, and the thickness of the AG / HC film layer is 2~5μm.

[0017] Compared with the prior art, the present invention can achieve the following beneficial effects: This invention utilizes a substrate-free black OCA tape as the adhesive layer, employing a uniform, non-layered black OCA colloid. The black OCA colloid possesses suitable visible light transmittance and haze, resulting in color and shielding performance that more closely resembles the display screen's outer frame when the screen is off. Furthermore, this black OCA colloid exhibits full-coverage bonding performance, minimizing the likelihood of bubbling and aging-related bubbling. Display screens manufactured using this substrate-free black OCA tape exhibit superior appearance and meet full-coverage filling requirements. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the substrate-free black OCA tape of this utility model.

[0019] Figure 2 This is a structural schematic diagram of an embodiment of the display screen of this utility model.

[0020] In the diagram, 10 is the light release film, 20 is the black OCA colloid, 30 is the heavy release film, 40 is the LED, 41 is the PCB board, 42 is the LED chip, 50 is the PET layer, and 60 is the AG / HC film layer.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0022] like Figures 1 to 2 As shown, this embodiment provides a substrate-free black OCA tape and a display screen made from the tape.

[0023] Specifically, the substrate-free black OCA tape is composed of a light release film 10, a black OCA adhesive 20, and a heavy release film 30 stacked sequentially. The light release film 10 and the heavy release film 30 are respectively disposed on both sides of the black OCA adhesive 20 to protect the black OCA adhesive 20. The substrate-free black OCA tape can be wound into a roll.

[0024] The black OCA colloid 20 is a uniform, non-layered colloid, consisting of a single alternating layer without a multi-layered structure. This avoids the delamination or bubble formation caused by differences in hardness between multiple layers of colloid. The black OCA colloid 20 has a visible light transmittance of 40±5% and a haze of 40±5%, allowing light to pass through during display without excessively affecting the display. It also provides high opacity when the screen is off, enabling the black OCA colloid 20 to display a deep black color that matches the screen's frame, reducing color differences and improving the screen's appearance.

[0025] The black OCA colloid 20 has a thickness greater than 100μm and does not contain an oil-based substrate, which gives it good full-coverage filling properties and makes it less prone to bubbling.

[0026] The thickness of the light release film 10 is less than the thickness of the heavy release film 30, and the thickness of the heavy release film 30 is less than the thickness of the black OCA colloid 20. Reducing the thickness of the release film helps to reduce costs.

[0027] In some examples, the thickness of black OCA colloid 20 is 150~250μm, which has better filling performance and is easy to photocur.

[0028] In some examples, black OCA Colloid 20 is made with acrylic adhesive, which has good adhesion, filling properties, aging resistance, and degradation resistance. Ink can be added to the acrylic adhesive to adjust the color and obtain the desired black.

[0029] In some examples, the acrylic adhesive of black OCA colloid 20 is UV cured once. After the first UV curing, the black OCA colloid 20 is not completely cured, so the black OCA colloid 20 in the tape is solid, which prevents the black OCA colloid 20 in the tape from flowing. Moreover, the black OCA colloid 20 has low viscosity, so it can be easily removed during use and has good reworkability.

[0030] In some examples, the thickness of the light release film 10 is 50–75 μm, and the thickness of the heavy release film 30 is 75–100 μm, providing sufficient support and protection for the black OCA colloid 20 and making it easy to tear.

[0031] In some examples, the light release film 10 and the heavy release film 30 are both made of PET material, which has good light transmittance and facilitates the photocuring of the black OCA colloid 20. The light release film 10 and the heavy release film 30 can be single-sided release films.

[0032] In some examples, the tape is used for a display screen comprising sequentially stacked LEDs 40, black OCA colloid 20, a PET layer 50, and an AG / HC film layer 60, wherein the black OCA colloid 20 is the same as the black OCA colloid 20 in the tape. For example, the black OCA colloid 20 of the tape can be peeled from the light release film 10 and the heavy release film 30 and bonded between the LEDs 40 and the PET layer 50 to achieve display screen bonding. The AG / HC film layer can be an AG-treated anti-glare film and / or an HC-treated hardening film.

[0033] In some examples, after the black OCA colloid 20 is bonded to the LED 40, it undergoes a second curing process. The black OCA colloid 20 is then UV-cured again after bonding. This second curing enhances adhesion, increasing the colloid's tack by over 1000 gf / inch, thus ensuring better RA performance. Furthermore, the resulting black OCA colloid 20 is less prone to bubbling and does not fade after UV aging.

[0034] In some examples, LED 40 includes a PCB board 41 and an LED chip 42 disposed on the PCB board 41. The LED chip 42 can form a raised / lowered structure on the PCB board 41. Black OCA colloid 20 coats the LED chip 42. The black OCA colloid 20, after one-time curing, has good filling properties and can fill and coat the LED chip 42, avoiding the formation of air bubbles.

[0035] In some examples, the PET layer 50 has a thickness of 40~80μm, and the AG / HC film layer 60 has a thickness of 2~5μm, serving a protective function.

[0036] Finally, it should be emphasized that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A substrate-free black OCA tape, characterized in that... It consists of a light release film, a black OCA colloid, and a heavy release film stacked sequentially. The black OCA colloid is a uniform, non-layered colloid with a visible light transmittance of 40±5% and a haze of 40±5%. The thickness of the light release film is less than that of the heavy release film, and the thickness of the heavy release film is less than that of the black OCA colloid. The thickness of the black OCA colloid is greater than 100 μm.

2. The substrate-free black OCA tape according to claim 1, characterized in that... The thickness of the black OCA colloid is 150~250μm.

3. A substrate-free black OCA tape according to claim 1 or 2, characterized in that... The black OCA colloid is made of acrylic adhesive.

4. The substrate-free black OCA tape according to claim 3, characterized in that... The acrylic adhesive of the black OCA colloid undergoes one UV curing process, after which the black OCA colloid is not fully cured.

5. A substrate-free black OCA tape according to claim 1 or 2, characterized in that... The thickness of the light release film is 50–75 μm, and the thickness of the heavy release film is 75–100 μm.

6. A substrate-free black OCA tape according to claim 1 or 2, characterized in that... The light release film and the heavy release film are both made of PET material.

7. A display screen, characterized in that... It includes LEDs, black OCA colloid, PET layer and AG / HC film layer stacked in sequence. The black OCA colloid is a uniform non-layered colloid with a visible light transmittance of 40±5% and a haze of 40±5%.

8. A display screen according to claim 7, characterized in that... The thickness of the black OCA colloid is 150~250μm; The black OCA colloid is made of acrylic adhesive; The black OCA colloid is bonded to the LED and then cured twice.

9. A display screen according to claim 7 or 8, characterized in that... The LED includes a PCB board and an LED chip disposed on the PCB board, and the black OCA colloid covers the LED chip.

10. A display screen according to claim 7 or 8, characterized in that... The thickness of the PET layer is 40~80μm, and the thickness of the AG / HC film layer is 2~5μm.

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