Pixel unit and preparation method thereof, oled array substrate and display device

Abstract

The invention, which relates to the technical field of the display device, discloses a pixel unit and a preparation method thereof, an OLED array substrate and a display device. The pixel unit comprises a red-green-blue sub pixel and a dark blue sub pixel. The red-green-blue sub pixel includes a luminescent layer arranged between an anode and a cathode; the luminescent layer consists of a red luminescent layer, a green luminescent layer, a sky-blue luminescent layer, and a first dark blue luminescent layer, wherein the red luminescent layer, the green luminescent layer, and the sky-blue luminescent layer cover the anode and are arranged at the same layer and the first dark blue luminescent layer covers the red luminescent layer, the green luminescent layer, and the sky-blue luminescent layer. The dark blue sub pixel includes a second dark blue luminescent layer arranged between an anode and a cathode. According to the technical scheme, each pixel unit contains four kinds of colors and advantages of the sky-blue luminescent layer and the dark blue luminescent layers are combined, so that the colors and service life of each pixel unit are improved. In addition, the luminescent layers are formed by the process of combination of ink-jet printing and evaporation; and the production process of the whole pixel unit is simplified, the utilization rate of materials and the production efficiency are improved.

Description

technical field [0001] The present invention relates to the technical field of display devices, in particular to a pixel unit and a preparation method thereof, an OLED array substrate and a display device. Background technique [0002] Compared with LCD, organic electroluminescent device (OLED) has the advantages of self-luminescence, fast response, wide viewing angle, high brightness, bright color, light and thin, etc., and is considered to be the next generation display technology. [0003] Organic electroluminescent device (OLED) thin film deposition methods mainly include vacuum evaporation and solution process: 1. Vacuum evaporation is suitable for small organic molecules. The film formation is uniform and the technology is relatively mature, but the equipment investment is large and the material utilization Low efficiency, low alignment accuracy of mask for large-sized products; 2. Solution process, including spin coating, inkjet printing, nozzle coating method, etc., ...

AI Technical Summary

Problems solved by technology

At present, deep blue organic electroluminescent materials have excellent color reproduction range in blue organic electroluminescent materials, but their lifespan and efficiency are low; sky blue organic electroluminescent materials have excellent lifespan and efficiency, but their color range is narrow

Moreover, the solution-type sky-blue organic electroluminescent material has a large gap with the evaporation-type dark blue organic electroluminescent material in terms of color and lifespan.

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