CN105082814B - A method of improving electronic printing precision by surface imbibition characteristic - Google Patents

Abstract

The invention discloses a method for improving electronic printing precision by means of surface wetting characteristics. According to the requirements of electronic printing image information, the method prepares easy-wetting areas and non-wetting areas on the surface of the printed substrate, so as to realize the precise positioning of printing ink in the easy-wetting areas. According to the present invention, there is a difference of 30°-170° in the wetting angle of the printing ink between the non-wetting area and the easy-wetting area on the surface of the printed substrate. The printing ink can be solvent-based ink or water-based ink. The method of the invention is especially suitable for improving inkjet printing accuracy and correcting printing errors by means of wettability differences. The method of the invention can realize zero-error fixed-point printing of multi-layer ink.

Description

A method to improve the precision of electronic printing by means of surface wetting characteristics

technical field

The invention relates to the field of electronic printing, in particular to a method for improving the precision of electronic printing.

Background technique

Printed electronics technology is an electronic manufacturing technology based on printing principles. In the past 50 years, silicon-based semiconductor microelectronics has occupied an absolute dominant position in electronic technology. However, due to the increasing complexity of silicon-based integrated circuit manufacturing technology and the huge investment required, the manufacture of silicon-based integrated circuits is completely monopolized in the hands of a few large companies in the world. Therefore, the research and development of solubilized organic and inorganic semiconductor materials in the past 10 years has given birth to the exploration and research of manufacturing various electronic devices with traditional printing technology, which has resulted in printed electronics. Printed electronics can print both inorganic electronic materials and organic electronic materials; it can be printed on silicon, glass, stainless steel substrates, or on plastic or paper substrates; it can be printed on rigid substrates, or printed on Can be printed on flexible substrates. The biggest features and advantages of printed electronic products are large area, flexibility and low cost, which are in sharp contrast with silicon-based microelectronic products. The equipment investment required for printing and manufacturing electronic devices is extremely low, and printed electronic devices can be fabricated on any substrate material. Although the performance of printed electronic devices is not as good as that of silicon-based microelectronic devices, the advantages of cost, large area and flexibility make printed electronic technology still have a large number of application fields that silicon-based microelectronic devices are not capable of.

However, in the process of printing electronic preparation, a very important issue is accurate alignment. Due to the error of printing process equipment, the positioning accuracy of the photo is low, which affects the effect of electronic printing circuit. Secondly, when performing multi-layer printing, the same point needs to be positioned repeatedly, and the slightest alignment error between different printing layers will affect the performance of electronic devices. Therefore, it is very necessary to develop a process method that can improve printing accuracy.

Contents of the invention

Purpose of the invention: Aiming at the above-mentioned prior art, propose a method for improving printing precision by means of surface wetting characteristics, so as to realize high precision of electronic printing.

Technical solution: A method for improving the accuracy of electronic printing by means of surface wetting characteristics. First, prepare patterns of easy-wetting areas and non-wetting areas on the surface of the substrate according to the printing information. The contact angle of the printing ink in the non-wetting areas and easy-wetting areas exists The difference between 30°—170°; then, the electronic printing step is carried out in the easy-wetting area, and when the ejected ink droplet is in contact with the non-wetting area and the easy-wetting area at the same time, the ejected ink droplet will automatically leave under the action of surface tension The non-wetting area and covering the wetting area realize the automatic correction of electronic printing errors.

Further, the prepared non-wetting region pattern has super-hydrophobic or super-amphiphobic properties.

Further, the surface of the non-wetting region has a micro-scale structure or a nano-scale structure or a micro-nano dual structure.

Beneficial effects: Compared with the prior art, the method for improving the precision of electronic printing in the present invention makes full use of the difference in wettability of printing ink in different areas on the surface of the substrate to realize the zero-error effect of electronic printing ink. The printing ink can be solvent-based ink or water-based ink. According to the printing information, the easy-wetting area and the non-wetting area are prepared on the substrate, so that the contact angle of the printing ink in the non-wetting area and the easy-wetting area has a range of 30°-170°. The difference is to use the wettability difference between the two areas to realize the active stay of the jetted ink droplet in the wetted area. The method does not need to rely on physical structural barriers, and can avoid the problem of uniformity of printing and film formation caused by the weak lyophobic properties of the barriers.

Further, the non-wetting region is prepared to have super-hydrophobic or super-amphiphobic properties. When multi-layer printing requires repeated positioning, the first layer of printing ink on the surface of the wetted area dries to form a smooth film. When the second layer is printed, the contact angle of the printing ink on the film is generally less than 90°, because the printing ink The contact angle of the non-wetting area of super-hydrophobic or super-amphiphobic properties is greater than 150°, and the contact angle difference between the film formed by printing ink on the first layer and the non-wetting area makes it possible to spray ink droplets when printing the second layer. It can complete the automatic correction of the position, and so on to complete the repeated precise positioning during multi-layer printing.

Description of drawings

Fig. 1 is a schematic top view of the process of correcting electronic printing errors in the present invention by means of surface wetting characteristics;

Fig. 2 is a schematic side view of the electronic printing error correction process realized by means of surface wetting properties in the present invention.

Detailed ways

The present invention will be further explained below in conjunction with the accompanying drawings.

A method for improving printing accuracy by means of surface wetting properties, which is used in the field of printing and display in this embodiment. First of all, according to the printed information, the easy-to-wet area and the non-wet area are prepared on the surface of the substrate. The difference in wettability between the two areas is mainly reflected in the contact angle of the printing ink in these two areas; traditionally, the contact angle of the material surface is less than 90° In order to have easy wetting characteristics, the contact angle of the material surface is greater than 90° to have non-wetting characteristics. Due to the difference in contact angle, the printing ink is easy to contact with the easy-wetting area, while the adhesion is extremely low in the non-wetting area. In this embodiment, a certain pixel unit is taken as an example, the area outside the pixel unit is prepared as a non-wetting area, and the pixel unit is prepared as a wetting area. When only single-layer printing is required, in order to realize the automatic correction of the position error of ejected ink droplets in electronic printing, the contact angle difference between the non-wetting area and the easy-wetting area should meet the range of 30°-170°, and the contact angle difference The larger the value, the more significant the difference in invasiveness and the better the effect of automatic correction.

The electronic printing step is carried out in the easy-to-wet area. When the jetted ink drop contacts the non-wetted area and the easy-to-wet area at the same time, the jetted ink droplet automatically leaves the non-wetted area and covers the wetted area under the action of surface tension, realizing automatic correction of electronic printing errors . The automatic correction process is shown in Figures 1 and 2. The printing area corresponds to the easily wetted area 10, and its surrounding area is the non-wetted area 11. When the inkjet printing device sprays ink droplets 12 to the pixel point, the printing process equipment error causes the spraying When the ink drop 12 contacts the substrate initially, the ejected ink drop 12 will be at the junction of the non-wetting area 11 and the easy-wetting area 10 , as shown in FIG. 1( a ). Due to the difference in wetting between the two areas in contact with the jetted ink droplet 12, the jetted ink droplet 12 will automatically leave the non-wetting area 11 and cover the wetted area 10 under the action of surface tension, and finally volatilize to form a film, as shown in Figure 1(b). As shown in Figure 2(a), in this embodiment, at the moment when the ejected ink drop 12 contacts the substrate, the contact angle with the non-wetting region 11 is 110°, and the contact angle with the easy-wetting region 10 is 50°, forming an asymmetric form ; Under the action of surface tension, the ejected ink droplet 12 automatically moves away from the non-wetting area 11 and covers the easy-wetting area 10, as shown in Figure 2(b).

Further, regular or irregular micron-scale structures or nano-scale structures or micro-nano double structures are prepared in advance in the non-wetting region 11, which can be prepared by using organic materials or inorganic materials. The preparation methods can be: chemical growth method, laser engraving Etching method, chemical etching method, electrochemical growth method, physical deposition method and other micro-nano processing methods. The double structure prepared by the above method makes the non-wetting region 11 realize super-hydrophobic or super-amphiphobic properties. Super-hydrophobic properties mean that the contact angle of water-based ink in this area is greater than 150°. The ink wetting angles are all greater than 150°. When the non-wetting region 11 has super-hydrophobic or super-amphiphobic properties, the easy-wetting region 10 is suitable for multi-layer electronic printing. Taking the above-mentioned pixel unit as an example, after the first layer of printing is performed, the printing ink dries to form a smooth film , when the second layer is printed, the contact angle of the printing ink on the film is generally less than 90°. Since the contact angle of printing ink in the non-wetting area of super-hydrophobic or super-amphiphobic properties is greater than 150°, the contact angle difference between the film formed by printing ink on the first layer and the non-wetting area makes the spraying when printing the second layer The ink droplet can also complete the automatic correction of the position, and so on to complete the repeated precise positioning during multi-layer printing, so as to realize the precise deposition of multi-layer luminescent materials in the pixel.

In this method, corresponding printing information on the surface of the easily wettable area 10 can be realized by designing the relative position patterns of the easily wettable area 10 and the non-wettable area 11 on the substrate surface. Since the printing ink is only deposited in the wettable area 10, the shape of the wettable area 10 determines the final printed pattern.

The above is only a preferred embodiment of the present invention, and any printed images, printed electronic devices, and other methods and technologies evolved from this method to achieve precise printing by means of wettability differences are protected by the method of the present invention. within range.

Claims (1)

1. a kind of method improving electronic printing precision by surface imbibition characteristic, it is characterised in that：First, according to printing information Easy wetted area and non-infiltration regional graphics are prepared in substrate surface, printing ink is in the non-infiltration region and easy wetted area Contact angle there are 30-170 differences；Then, electronic printing step is carried out in the easy wetted area, when injection ink droplet When being contacted simultaneously with the non-infiltration region and easy wetted area, injection ink droplet leaves non-infiltration automatically under surface tension effects Region simultaneously covers wetted area, realizes the automatic correction of electronic printing error；The non-infiltration regional graphics prepared have super Hydrophobic property or super-amphiphobic characteristic；The non-infiltration region surface is micron scale construction or nanoscale structures or micro-nano dual knot Structure, superhydrophobic characteristic refer to contact angle of the water-based ink in the region and are more than 150, and super-amphiphobic characteristic refers to solvent-based inks It is all higher than 150 with water-based ink infiltration angle.