Packaging adhesive, packaging method, display panel and display device

Abstract

The present disclosure provides a packaging adhesive, a packaging method, a display panel, and a display device. The packaging adhesive includes a frit, an organic solvent, and a material with a thermal expansion coefficient larger than that of the frit. Using the packaging adhesive provided by the present disclosure, the thermal expansion coefficient of the packaging adhesive from which the organic solvent is removed may be enhanced by doping the material with a thermal expansion coefficient larger than that of the frit into existing glass cement, so that in a packaging process using laser radiation, an expansion volume of the packaging adhesive when heated is increased. In this way, a gap between the packaging adhesive and an array substrate is effectively reduced, and a packaging effect is improved.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This patent application is a National Stage Entry of PCT / CN2016 / 079368 filed on Apr. 15, 2016, which claims the benefit and priority of Chinese Patent Application No. 201510230326.8 filed on May 7, 2015, the disclosures of which are incorporated herein in their entirety as a part of the present application.BACKGROUND[0002]The present disclosure relates to a field of display, and more particularly, to a packaging adhesive, a packaging method, a display panel, and a display device.[0003]In recent years, as an emerging flat panel display, an organic light-emitting diode (OLED) display has drawn widespread attention. Because of being very sensitive to water vapor and oxygen, an OLED device needs to be packaged so as to be isolated from the water vapor and the oxygen in practical application, and thus the service life of the OLED can be prolonged.[0004]In the existing fabrication process of OLED displays, frit is generally employed to finish p...

AI Technical Summary

Benefits of technology

The present patent provides a packaging adhesive that can be used to improve the packaging efficiency of organic light-emitting diodes (OLEDs). By adding a material with a higher thermal expansion coefficient to the existing glass cement, the adhesive can expand more when heated during the packaging process, reducing the gap between the adhesive and the substrate. This improves the packaging effectiveness and prevents delamination, resulting in better performance of the OLEDs.

Problems solved by technology

However, for a large-size panel, a height difference of the formed frit is difficult to be controlled within 1 μm due to difficulties in coating technologies and baking technologies, as shown in FIG. 1.

In this region, a gap is formed between the surface of the frit 300′ and that of the array substrate 200′, which causes poor packaging.

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