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ROLLER CONVEYER SYSTEM FOR SUPPRESSING ELECTROSTATIC CHARGE FOR FLAT PANEL DISPLAY BACKPLANES COMPOSED OF THIN GLASS SUBSTRATES

IP.com Disclosure Number: IPCOM000249954D
Publication Date: 2017-May-08

Publishing Venue

The IP.com Prior Art Database

Abstract

Flat panel displays generally include two backplanes composed of thin display glass substrates. These glass backplanes are often transported on conveyer roller systems. During transportation, electrostatic charge can be accumulated on the surface of the glass backplane due to contact between the glass backplane and the rollers of the conveyer roller system. This electrostatic charge may result in electrostatic discharge failure or the attraction of contaminants to the glass substrate, also referred to as "stickiness." A roller conveyer system has been developed to combat these issues that consist of two different rollers where one roller is configured to impart an electrostatic charge to the glass backplane while the other takes the electrostatic charge away from the glass backplane. In this way, the rollers can minimize electrostatic charge on the glass substrate backplane.

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ROLLER CONVEYER SYSTEM FOR SUPPRESSING ELECTROSTATIC CHARGE

FOR FLAT PANEL DISPLAY BACKPLANES COMPOSED OF THIN GLASS

SUBSTRATES

ABSTRACT

Flat panel displays generally include two backplanes composed of thin display glass

substrates. These glass backplanes are often transported on conveyer roller systems. During

transportation, electrostatic charge can be accumulated on the surface of the glass backplane due

to contact between the glass backplane and the rollers of the conveyer roller system. This

electrostatic charge may result in electrostatic discharge failure or the attraction of contaminants

to the glass substrate, also referred to as “stickiness.” A roller conveyer system has been

developed to combat these issues that consist of two different rollers where one roller is

configured to impart an electrostatic charge to the glass backplane while the other takes the

electrostatic charge away from the glass backplane. In this way, the rollers can minimize

electrostatic charge on the glass substrate backplane.

BACKGROUND & SUMMARY

Flat panel displays (FPD) generally consist of two backplanes including a thin film

transistor (TFT) backplane and a color filter (CF) backplane. Both of said backplanes are

composed of thin display glass substrates, which are often transported by conveyer roller system.

Alkali-free glasses that do not contain alkali metal oxides are often used as LCD backplanes and

have been specialized for LCD backplanes, which are often exposed to high temperatures.

During transportation, electrostatic charge (ESC) can accumulate by contact between conveyer

rollers and surface of glasses on the surface of the glass substrate. ESC may result in

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electrostatic discharge (ESD) on backplanes. Electrostatic discharge (ESD) can lead to failure of

the backplane. As such, ESD is a critical issue during conveyer transportation.

To combat ESC and possible ESD, FPD manufacturers sometimes use antistatic agents to

coat the surface of the glass substrates or use an air ionizer to eliminate ESC on the glass

substrate. However, these methods are not always sufficient. An ESC/ESD event can occur

during or at conveyance after high temperature processing steps, which may lower production

yield.

Other methods have also been tried in other manufacturing areas. For example, rollers

have been used to suppress ESC between printing papers and guide rollers on which iron and

aluminum is patterned (see JPU11984-176841). Coated iron areas generate positive charge on

paper and aluminum areas generate negative charges to neutralize the charges on the paper. The

advantage of this method is the simplicity of modification on printing systems. However, these

metal patterns can easily make scratches on display glass surfaces and, thus, this system cannot

be used for transporting glass backplanes. In another method, ESC suppression between a

conveyed box containing electrical parts inside and a conveyer roller was achieved by

minimizing the discrepancy of effect...