Method and packaging structure for detecting water and oxygen penetration rate of back plate

Abstract

The invention provides a method and packaging structure for detecting the water and oxygen penetration rate of a back plate. The method includes the following steps that a metal electrode pattern is formed in the back plate to be detected; a calcium film is formed on the back plate provided with the metal electrode pattern; the back plate provided with the metal electrode pattern and the calcium film is used as a partition plate to separate a drying chamber from a moist chamber; the change value of the electrical conductivity of the calcium film is measured through the metal electrode pattern, and the water and oxygen penetration rate of the back plate is determined according to the measured change value. According to the method and packaging structure for detecting the water and oxygen penetration rate of the back plate, the calcium film is arranged on the back plate to be detected, the whole back plate is used as the partition plate separating the drying chamber from the moist chamber, and the water and oxygen penetration rate is detected; compared with the mode that only back plate packaging materials are detected in the prior art, the method and packaging structure for detecting the water and oxygen penetration rate of the back plate have the advantages that the real environment of a device needing to be protected can be reflected more really, and detection accuracy of the water and oxygen penetration rate of the back plate is improved. Moreover, an electrode used for detecting the electrical conductivity is made on the back plate to be detected so that detection difficulty can be lowered.

Description

Technical field [0001] The present invention relates to the field of detection technology, in particular to a method and packaging structure for detecting the water and oxygen transmission rate of a backplane. Background technique [0002] Organic Light Emitting Device (OLED) is widely used in the display field due to its advantages of lightness and thinness, high brightness, fast response, and low power consumption. Studies have shown that water and oxygen in the environment have a great impact on the life of OLED. The main reasons are: 1. The water and oxygen easily react with low work function cathode metals (such as aluminum, magnesium, calcium); 2. The organic material undergoes a chemical reaction. Therefore, effective encapsulation of the OLED can effectively prevent the moisture in the atmosphere from contacting the functional layers of the device, which can extend the life of the device. [0003] In the prior art, when the water and oxygen transmission rate of the OLED b...

AI Technical Summary

Problems solved by technology

However, it cannot reflect the actual water vapor transmission rate of OLED devices, because in actual packaging, there are complicated metal lines and corners on the backplane, and poor sealing is prone to occur in these places

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