The Data Courier
Omron RFID application stories

Episode 7: LCD and colour filter manufacturing control

There exists a problem that mid-process replacement of LCDs in bar code cassette control systems necessitates frequent exchanges with the host system. This is achieved through a complex system and programming that is very difficult to change. The IPA cleaning process can result in bar code deterioration and drops of water on the surface also increase the likelihood of reading errors.

The solution to this is to replace the barcodes and replace them with RFID tags. These enable the storage of work instructions and information (product information, process instructions and information, process completion information, substrate information, and inspection results) in the ID Tags mounted to the cassettes and provide distributed management of the necessary information. The mounted ID Tags have high resistance to difficult environments such as water or chemicals; they also have a long life expectancy and exceptionally good read/write reliability of cassette data.

There are four key benefits of this approach is that unlike production control systems using bar codes, repeated exchanges with the host are not necessary and production is possible based on the information in the Data Carriers. This obviously makes for a much simpler production programme and process system.
Secondly the read/write reliability is very high and so problems such as line stoppages due to errors can be avoided. Next, the RFID uses non-contact communications and therefore no particles, thus contributing to a higher yield rate. Fourth, replacing bar code labels and other similar kinds of maintenance are not required resulting in excellent reductions in running costs.

The important features of the components used (see the diagram above) is the high resistance to the environment; noise, chemicals etc, they allow cleaning in pure water, IPA cleaning, ultrasonic cleaning, exposure to temperatures up to 150°C and even vacuums. There data capture is also impressive being able to hold substantial information due to their capacity of up to 8 Kbytes.

Micromech is the systems integrator for Omron RFID systems, if you wish to find out more contact Stirling Morley on 01376 333311 or stirling@micromech.co.uk

‘Micromech, keeping track with Omron’