Organic light-emitting display device

Abstract

The invention provides an organic light-emitting display device. The organic light-emitting display device comprises a first substrate, a second substrate, a plurality of organic light-emitting elements and a conductive layer. The first substrate and the second substrate are arranged oppositely. The organic light-emitting elements are arranged on the side, facing the second substrate, of the first substrate. Each organic light-emitting element comprises an anode arranged on the first substrate, an organic light-emitting layer arranged on the anode and a cathode arranged on the organic light-emitting layer. The conductive layer is arranged on the side, facing the first substrate, of the second substrate. The conductive layer makes contact with the cathodes. Due to the fact that the conductive layer makes contact with the cathodes, sheet resistance of cathode layers can be reduced, and voltage drop, on the cathode layers, of driving signals can be reduced. Thus, the difference of values of currents flowing through all the organic light-emitting elements is reduced, light emitted by the organic light-emitting elements are more similar in intensity, and the display brightness of the whole organic light-emitting device tends to be uniform.

Description

technical field [0001] The present invention relates to the field of organic light-emitting display, and more specifically, relates to an organic light-emitting display device displaying a more uniform top emission structure. Background technique [0002] Organic Light Emitting Display (OLED, Organic Light Emitting Display) is a thin-film light-emitting device made of organic semiconductor material and driven by DC voltage, which has the characteristic of self-luminescence. [0003] An organic light-emitting display device with self-luminous properties includes an organic light-emitting element including an organic light-emitting layer, an anode, and a cathode. Organic light-emitting display devices are classified into top-emission structures and bottom-emission structures according to different light emitting directions of organic light-emitting elements. The light emitted by the organic light-emitting element in the top-emission organic light-emitting display device is em...

AI Technical Summary

Problems solved by technology

The cathodes of multiple organic light-emitting elements are connected together to form a whole-surface cathode layer, and the cathode of each organic light-emitting element is connected to the cathode via hole outside the display area through this entire-surface cathode layer to obtain the cathode from the outside. However, due to the high surface resistance of the transparent conductive material, the cathode driving signal will generate a voltage drop on the cathode layer, and the distance between the cathode of the organic light-emitting element at different positions in the display area and the cathode via hole is different, so it is different. The cathode driving signal of the organic light-emitting element at the position will have different voltage losses on the cathode layer, and the input driving voltage is the same during display, resulting in a difference in the voltage drop on each organic light-emitting element, resulting in a difference in the magnitude of the current, causing The problem of inconsistent display brightness in the display area

Moreover, this inconsistent display brightness will become more obvious as the cathode layer becomes thinner, but the transmittance of an overly thick cathode layer is poor, which is not conducive to the light emission of organic light-emitting elements.

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