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Printing device and printing method

A technology for printing devices and driving devices, which is applied to printing devices, printing, electrical components, etc., can solve the problems of increasing the number of production processes, degrading the performance of light-emitting devices, and weak product competitiveness, etc., and achieves reducing the number of process processes and eliminating solvents The effect of the difference in steam concentration and the shortening of the printing process

Active Publication Date: 2020-07-31
GUANGDONG JUHUA PRINTING DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Make the overall drying process complicated and inefficient
This is because most light-emitting devices require multiple printing processes of inks with different functional materials, which also require multiple vacuum drying and vacuum-breaking printing processes, which obviously increases the number of production processes.
[0005] (2) The one-time vacuum drying process after printing is easy to cause uneven film formation in the production of medium and large display panels
This is because there is likely to be a large vapor pressure difference above the large-scale printed pattern, which leads to the extremely uneven film formation of pixels at the edge of the pattern and the formation of mura (color halo)
This not only leads to a decrease in the performance of the light-emitting device, but also makes the product less competitive

Method used

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  • Printing device and printing method
  • Printing device and printing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] The situation of printing a small amount of ink in the pixel pit of embodiment 1

[0080] Please combine further image 3 , for a functional layer with a thin film thickness, such as a material with a film thickness of about 20 nm to 30 nm. Generally, in one sub-pixel, if the print head 210 prints at a speed of 10 pl per drop, only 5 to 8 drops of ink (less than 80 pl) are needed, and the liquid level is relatively thin at this time. After printing by the print head 210 , the ink falls into the pixel pit 3 surrounded by the pixel defining layer 2 to be distributed and spread, and then the vacuum drying mechanism 300 moves over this area to vacuum dry it.

[0081] At this time, since there is less ink, its surface area is larger and it is easy to volatilize, the lateral flow of ink in the pixel pit 3 is relatively small. As the vacuum drying mechanism 300 moves forward, the ink in the pixel pit 3 has been completely dried to form a film. After the printing is complete...

Embodiment 2

[0082] Embodiment 2 The situation where a large amount of ink is printed in the pixel pit

[0083] Please combine further Figure 4 , for a thicker functional layer, such as a material with a film thickness of about 40nm-80nm. Generally, in one sub-pixel, the print head 210 needs 10 to 18 drops of ink to print with 10 pl per drop, and the liquid level is relatively thick at this time. After printing by the nozzle, the ink falls into the pixel pit 3 surrounded by the pixel defining layer 2, and is distributed and spread. At this time, the thickness of the ink is e1 and the viscosity is η1, and the lateral flow rate of the ink at this time is Q1. Because the ink is thick, its lateral flow Q1 is very large, which easily leads to uneven ink film formation.

[0084] Because there is more ink, it is more difficult to volatilize. Then, when the vacuum drying mechanism 300 advances, most of the ink in the pixel pit 3 can be dried and formed into a film.

[0085] After the vacuum d...

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Abstract

The invention relates to a printing device and a printing method. The printing device includes a printing mechanism and a vacuum drying mechanism, wherein the printing mechanism includes a printing head and a mobile driving device, and the printing head is connected with the mobile driving device and can be driven to move by the mobile driving device; the vacuum drying mechanism is provided with a suction port, and the vacuum drying mechanism It is connected with the mobile drive device and can be driven by the mobile drive device to move synchronously with the print head to realize the step-by-step vacuum drying of the printed ink. The printing device can improve the uniformity of final film formation, greatly shorten the entire printing process, reduce production costs, improve printing production efficiency, increase device production yield, and enhance device performance.

Description

technical field [0001] The invention relates to the field of display production equipment, in particular to a printing device and a printing method. Background technique [0002] With the gradual development of display technology, OLED and other devices have attracted the attention of all parties because of their excellent display performance. Conventional evaporation methods to manufacture OLEDs and other light-emitting devices face problems such as low material utilization and the need for ultra-fine masks, resulting in high production costs. In order to further reduce the production cost of light-emitting devices such as OLEDs, devices such as OLEDs can be produced by printing technology. [0003] One of the key problems in the production of devices such as OLEDs by printing technology is the drying and film-forming process after inkjet printing of functional material inks. The drying and film-forming process directly affects the display uniformity and life of the device...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/01B41J11/00
CPCB41J2/01B41J11/0015B41J11/0022H10K71/135
Inventor 董婷李耘
Owner GUANGDONG JUHUA PRINTING DISPLAY TECH CO LTD
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