Method for peeling off flexible substrate and display panel

Abstract

The present invention discloses a peeling method of a flexible substrate and a display panel. The adhesive film layer is provided with two layers, one is a first adhesive layer including an optical adhesive, and the other is a second adhesive layer including an optical adhesive (OCA) and a yellow polyimide (PI) doped in the optical adhesive. By using the high absorbance of the second adhesive layer and the transmittance characteristic of 308 nm laser, As the 308 nm laser passes through the backplate, the 308 nm laser energy is absorbed by the second adhesive layer to form an extremely high temperature, resulting in failure of the first adhesive lay and carbonization of the second adhesive layer, thereby carbonizing the adhesive film layer. After the adhesive film is carbonized, the back plate can be easily separated from the flexible substrate, so as to achieve the purpose of smooth rework, and at the same time, the flexible display panel can not be damaged, thereby reducing the scraprate of the defective products and greatly reducing the production cost.

Description

【Technical field】 [0001] The invention relates to the display field, in particular to a method for peeling off a flexible substrate and a display panel. 【Background technique】 [0002] With the advancement of display technology, flexible AMOLED (Active Matrix Organic Light Emitting Diode) display screens have gradually become mainstream. At present, in the manufacturing process of a display device (such as an AMOLED display device, etc.), it is generally necessary to attach a polarizer on a cover glass of a panel (Panel) to form a display panel. [0003] The biggest advantage of OLED display devices compared with liquid crystal display devices (LCD) is that flexible (Flexible) OLED display devices can be manufactured to meet the market's high requirements for mobile and portable products. [0004] However, at present, the yield rate of flexible OLED display devices is lower than that of rigid OLED display devices and LCDs, because the manufacturing process of flexible OLEDs...

AI Technical Summary

Problems solved by technology

However, if the flexible OLED display device uses this method, since the hardness of the flexible substrate 22' is very low, it is very easy to be scratched or even pierced by a knife (Knife) 29, thereby damaging the array layer 24' and the OLED layer 25'. During the opening process, the adhesive force between the rigid liner 28' and the flexible liner 22' is about 500Kg / inch 2 , far greater than the tearing force 10Kg / inch that the flexible OLED display panel 20' can bear 2 Therefore, in the process of tearing, it will cause mutual peeling (Peeling) between the multilayer structures of the flexible OLED display panel 20', thereby damaging the flexible OLED display panel 20' as a whole, so that subsequent rework cannot be performed and it will directly become a defective product. lead to scrap

Based on the above problems, not only the success rate of separation is extremely low, but also many defective products will be produced, which will inevitably greatly increase the production cost for manufacturers.

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