Spacer spray machines for LCD production.

Crystec Technology Trading GmbH
LCD Equipment

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Spacers in LCD-Technology

To ensure the uniform spacing of the two glass plates of an LCD display, spacers are used. Previously, spherical spacers have been sprayed onto one of the two glass plates, prior to the assembly of the LCD display. Today in most cases, so called litho-spacer are used - the spacers are defined by a lithographic processes and formed by deposition and etching technologies. The new process is particularly suitable for mass production of high-resolution displays. However, there are still some LCD applications, where high resolution is not required and the costs of the new litho-spacer are simply too high. Therefore, the conventional spacer spray process is still justified, even though nowadays it is hard to find a manufacturer for the corresponding spacer spray systems. Our former partner for spacer spray machines SE (Shibuya Electric) has stopped production as well as company of Nishin, formerly the largest manufacturer of dry spacer spray machines. Crystec can still assist you to find appropriate equipment.

Spacer Spray Technology

Special spacers, consisting of glass or plastic are sprayed on the lower glass plate of a display, in order to ensure the equal distance of the two glass plates over the hole LCD area. Spacer cluster formation needs to be avoided, because spacer clusters could be disturbingly visible in the display.

    Spacer Spray Machine
Spacer in LCD Spacer Spray Machine
Spacer on Glass
glass  glass
sealant  sealant
spacer          spacer
lc    liquid crystal

There are three different methods to spray spacers on the glass plate: Solvent can be used in order to assist the spraying process, spacer spraying can be performed completely dry and you can use a semi-dry process. All three methods have certain advantages and disadvantages.

The heart of the machine is the spray chamber with the spacer spray head. On the following picture, you can see such a spray head from above.

Spacer spray head Spacer spray equipment
SE Spacer Spray Head Shindo Spacer Spray Maschine

Spacer Spray Equipment is available as a stand alone tool as well as integrated, in-line equipment. For mass production spacer sprayers are combined with cleaning equipment and other process tools in a production line.

Spacer Spray System for Mass Production Inline Spacer Spray Tool
Integration of an SE spacer spray system in a fully automatic in-line production line.

Measurement of Spray Density

A quality check unit for the spacer spray process can be also included in an automatic machine. In this case a spacer counter is implemented. On the following picture you can see this type of wafer counter.

spacer counter   Measurement system

The distribution of the spacers on the glass plate needs to be very homogeneous in order to get high quality displays and spacer clusters are not allowed.

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