A vacuum drying device and a method for preparing a display substrate

Abstract

The embodiment of the present invention provides a vacuum drying device and a method for preparing a substrate for display, which relate to the field of display technology, and can make the liquid on the condensation plate flow into the tank, so as to prevent the liquefied liquid from dripping again on the object to be dried in the prior art , affecting the performance of the dry matter. A vacuum drying device, comprising a cavity, a condensation plate arranged on the top wall of the cavity; the condensation plate includes a plurality of protrusions arranged at intervals and protruding toward the bottom of the cavity; the vacuum The drying device also includes a plurality of grooves, each of which corresponds to one of the protrusions and the two are facing each other, and the opening of the grooves faces the condensation plate; the grooves and the condensation plate There is a gap between them.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a vacuum drying device and a method for preparing a substrate for display. Background technique [0002] Compared with liquid crystal displays, Organic Light-Emitting Diode (OLED) has the advantages of self-luminescence, fast response, wide viewing angle, high brightness, bright colors, light and thin, etc., and is considered to be the next-generation display technology. [0003] The deposition methods of the light-emitting layer in OLED devices mainly include vacuum evaporation and solution process. Vacuum evaporation is suitable for small organic molecules. The film formation is uniform and the technology is relatively mature, but the investment in equipment is large, the utilization rate of materials is low, and the alignment accuracy of large-scale products is low; the solution process includes spin coating, inkjet, etc. Printing, nozzle coating, etc. are suitable for polym...

AI Technical Summary

Problems solved by technology

However, during the drying process, the solution volatilizes, and the solvent in the solution volatilizes into a gaseous state and adheres to the inner upper wall of the vacuum drying device; the solute remains on the substrate and gradually forms a luminescent layer, and the vaporized solvent encounters a cold After being liquefied on the upper wall, it drips back onto the solute. On the one hand, the thickness of the solute at each position is inconsistent; The drying conditions are set to the optimal drying conditions, which affects the final formation of the emissive layer lower than expected

Based on the above reasons, the drying process of the prior art will affect the final display effect of the OLED display, resulting in the phenomenon of mottle (mura) on the display screen.

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