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- organic EL -

What is organic EL display?

The requid-crystal display, which you see the most often today, is used for personal computers, cellular phones, and even for TVs etc. these days.
Although the requid-crystal display has the merit of low power consumption, it does not emit light and thus needs to be lit from the back (backlight), being a stumbling block to miniaturisation and weight reduction.
 
The organic EL display, like the PDP (plasma display panel) etc., itself emits light. The structure is as if a very thin film of organic matter is gotten sandwiched between also very thin electrodes, and to put it in extreme terms, film-type rollable displays can be produced. Also, since it emits light itself, it does not need backlights: this is now the most hoped-for display that has both merits of high picture quality and high-speed imaging.
Figure 1: Comparison of capacity between requid-crystal display and organic EL display

Switchover to screen-printing

In the previous manufacturing process of organic EL, an adhesive agent to put two thin boards has been applied by a device called dispenser.
Since the dispenser applies an adhesive agent with one stroke, the total applying distance becomes long to manufacture many panels from one sheet of glass at a time and thus takes a lot of time.
That is why they have been considering applying an adhesive agent by means of screen-printing.
Screen-printing is capable of printing in 1/3 of time in comparison to applying by the dispenser; besides it makes no difference in time whether producing 10 pieces from one workpiece or 20 pieces.
 
The special purpose vacuum printer (based on LS-340VTVA), developed by NEWLONG, is capable of applying the same UV-hardening epoxy resin sealant of high viscosity/thixotropy for dispensors more finely than the dispenser making good use of the printing technology built up over many years through the production of the manufacturing equipment of liquid-crystal panels and PDPs.
 
Needless to say, bubbles do not form; besides the sealant is not affected by water, for the water is expelled by nitrogen filled in the space on releasing atmospheric air after printing or on loading/unloading the workpiece.
Moreover, this printer can be used not only for applying process of an adhesive agent but also for applying liquid desiccant, thin-film coating, etc.
Figure 2 : Sealant print sample (width of line is 320μm) *Especially the print of the corners are finer than that applied by the dispenser.

Featured in a magazine

The detailed information also appeared in a combined number for April 15/May 1, 2004 of E EXPRESS, a technical journal on flat display panel.
 
 
The site of the E express HERE>>>
 
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