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3-2 CAUTIONS TO PREVENT FROM ELECTROSTATIC DESTRUCTION UNDER ASSEMBLY WORK
Consider the following to prevent the static electricity from generating under assembly work. High-voltage static
electricity discharge destroys the circuit inside the module and it may cause failures
1) HUMIDITY
Maintain a work place in the range of 50 to 70% of relative humidity, to prevent generation and discharge of static
electricity.
2) GROUNDING
2-1) Cover the floor of a work area and a work desk with a conductive mat, and ground them, through resistance with
range of 0.5 MΩ to 1MΩ, to prevent discharge all at once.
2-2) Workers must wear a grounded wrist band.
2-3) Ground all metallic tools, jigs and equipment, such as a soldering iron and a screw driver, jigs, conveyors, or
metallic work benches, which are to be used for assembly work.
3) IONIZER
Using ionizer (an antistatic blower) is recommended at working area in order to reduce electro-static voltage.
4) REMOVING PROTECTION FILM
The protection film is stuck on an LCD panel before its shipment to prevent dust or scratch on the panel during
transportation, assembly work and otherwise. Remove a protection film on an LCD panel near the last process of
an assembly to prevent dust and scratch on the panel.
However, remove the film in advance in case of a set attached a module is inserted into high temperature chamber
for aging etc. If it is left without removing the film, it may cause irregular polarizer surface.
When removing the protection film, peel off the film from its edge, using round-ended tweezers with Teflon coating or
a cellophane tape attached on the edge of the protection film, carefully and slowly, spending more than 3 seconds.
In peeling off the protection film, blow the film using ionizer to eliminate ESD from the film.
Removal which does not comply with the above procedure may generate ESD and damage electric circuit of a LCD
module.
5) Do not touch bare metal portions of examination /inspection equipment. It causes to discharge electric charge of an
object or a human body.
6) Do not touch the mounting parts of PCB LCD module, circuit patterns or connector terminals with worker's hand or
conductive tools.
3-3 DUST AND STAIN PREVENTION
1) WORKING AREA
Handle the LCD module in the room without metallic dust. Especially when metallic dust adheres to the LCD module,
an internal electric circuit makes short-circuited and it may cause failures.
2) FINGER PRINT
Handle the LCD module fingerstalls or soft and dust-free gloves that do not produce dust when performing incoming
inspection of modules or assembling sets. Handling them with bare hand may damage module display quality.
Toshiba Matsushita Display Technology Co.,Ltd
Specification No. TENTATIVE
Date: 2008 – 11- 07
Date:
New No. LTA057A341F-14
Old
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No.
←# Special
←& Addition
Sheet
7
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