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.
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.
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.
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.
