A display substrate, its preparation method, and a display device

Abstract

The invention relates to the field of display technology, and discloses a display substrate, a preparation method thereof, and a display device. The display substrate includes a driving backplane, auxiliary electrodes located on the driving backplane, a pixel defining structure, a light-emitting functional layer, and a first electrode layer; the auxiliary electrodes and the pixel defining structure are located in the non-display area; the pixel defining structure surrounds the auxiliary electrodes, and is connected with the The auxiliary electrode surrounds a groove, and the auxiliary electrode is configured as the bottom wall of the groove; at least part of the side walls of the groove have electromagnetic properties, and are configured to use electromagnetic force to make it difficult for the charged evaporation material to deposit on the bottom wall of the groove ; The material of the light-emitting functional layer is configured as a charged evaporation material; the first electrode layer covers the groove and is in direct contact with the bottom wall of the groove. The above-mentioned display substrate is provided with an auxiliary electrode, which can solve the voltage drop problem of the first electrode layer, and the display substrate has a simple structure, and the contact connection between the first electrode layer and the auxiliary electrode can be realized through simple process steps, and the preparation method is simple.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a display substrate, a preparation method thereof, and a display device. Background technique [0002] Existing OLED devices are divided into two types: bottom emission and top emission. Since top emission can obtain a larger aperture ratio, it has become a research hotspot in recent years. Top emission needs to take into account the light transmittance, so a thinner transparent cathode is required, which will lead to poor conductivity. When the screen size is large, the central area of ​​the screen is far away from the electrode area, and the long-distance current transmission increases the driving voltage. If it is larger, it is easy to cause a large difference between the driving voltage of the OLED device in the central area of ​​the screen and the edge area of ​​the screen, that is, the problem of voltage drop (IR Drop). Therefore, it is necessary to improve the ca...

AI Technical Summary

Problems solved by technology

The top emission needs to take into account the light transmittance, so a thinner transparent cathode is required, which will lead to poor conductivity. When the screen size is large, the center area of ​​the screen is far away from the electrode area, and the long-distance current transmission increases the driving voltage. Larger, it is easy to cause a large gap between the driving voltage of the OLED device in the center area of ​​the screen and the edge area, that is, the problem of voltage drop (IR Drop)

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