Flat Panel Display Glass Research Articles

Water quality of runoff from flat panel display glass concrete during modified accelerated aging plus leaching tests.

Flat panel display glass (FPDG) from plasma televisions is difficult to recycle due to their heavy metal composition. When crushed, flat panel display glass has similar physical properties to sand and could be used as a recycled aggregate in concrete, if the potentially harmful metals in FPDG can be encapsulated. To replicate leaching from environmental exposure, at periodic points during freeze-thaw tests, samples of concrete with 0%, 10%, and 20% FPDG were exposed to simulated rainwater and the runoff water was analyzed. For the metals detected (arsenic, barium, chromium, and lead), lead concentrations in the leachate/runoff from 20% FPDG samples exceeded the acute ambient water quality criteria after approximately 50-60 cycles; however, no samples exceeded the toxic characteristic leaching procedure limits at any point during freeze-thaw testing. Increases in lead and chromium concentrations over time indicate a need for stabilization, especially since lead exceeded the acute water quality criteria. PRACTITIONER POINTS: TCLP results indicate flat panel display glass is not expected to release RCRA-8 metals at or above regulatory limits. Accelerated aging-leaching tests indicate lead might be released at levels approaching or exceeding the acute ambient water quality criteria. With additional lead stabilization, this study shows flat panel display glass has the potential to be used in concrete.

Flat panel display glass: Current status and future

Since the appearance of the Active Matrix Liquid Crystal Display (AM-LCD) in 1995, flat panel display has been the fast growing industry during two decades [1]. Now LCD became the most dominant display technology world-wide. The flat panel display glass also has walked together along with the LCD industry. Great difficulties for manufacturing the flat panel display glass have given high entry barriers for the leading 3 companies: Corning, Asahi and NEG. These 3 companies occupy about 95% share of the flat panel display glass market [2]. However, these days, new players struggle to take significant part in the market. In this paper the detailed technological difficulties are analyzed.Display industry, however, these days in the turmoil of the big change. Plasma display panel (PDP) has not been displayed in the exhibitions or showcases. LCD is going through the mature stage of the industrial life cycle. Lots of ownership change and M&A have reported in the news. After that OLED and lots of touch application gadget appeared in the market. Even though these new devises also use flat glasses, the required attributes are different from those of LCD. The differentiation is important topic in the display industry. Flexible display is interesting theme in both glass and display field. Even though final product appears as a thin plastic display [3], all the manufacturing process happens on the glass substrates.In spite of the drastic change of the display industry, the glass production shows continuous growth. The need of larger screen does not show the saturation. The popularity of touchable hand held devices could continue in near future [4]. However all these situations are not the gospel for the glass industry. The display companies in the red ocean, push down the price of the glass with tremendous pressure. So in near future flat panel display glass also needs breakthrough for survival.

디스플레이용 판유리 이송을 위한 양방향 이송 로봇장치

This study addresses the development of a full duplex robotic system for transferring flat-panel display glass. We propose to accomplish this using a bidirectional linear transfer mechanism in place of the conventional rotary transfer mechanism. The developed full duplex robot comprises a driving part that carries the glass panel laterally, vertical part that can be moved up and down by means of a ball screw and linear motion guide arrangement, and hand part that slides by the cylinder of the driving part along the guide rail with a V-guide bearing attached to the bottom of the support. In addition, an alignment part prevents the hand part from derailing and holds the hand part while the driving part moves horizontally. The full duplex robot lifts and drives a glass panel directly while transferring it to the buffer and does not require rotational motion. Therefore, both transferring and stacking are realized with a single device. This device can be used in existing industrial facilities as an alternative to existing industrial robots in current as well as future process lines. The proposed full duplex robot is expected to save considerable amounts of time and space, and increase product throughput.

FPD 공정용 Glass 이송 시스템을 위한 자기부상 EMS의 개발

In recent semiconductor and FPD (Flat Panel Display) manufacturing processes, high clean-class delivery operation is required more and more for short working time and better product quality. Traditionally SLIM (Single-sided Linear Induction Motor) is widely used in the liner drive applications because of its simplicity in the rail structure. A magnetically levitated (Maglev) unmanned vehicle with SLIM traction, which is powered by a CPS (Contactless Power Supply) can be a high precision delivery solution for this industry. In this paper unmanned FPD-carrying vehicle, which can levitate without contacting the rail structure, is suggested for high clean-class FPD delivery applications. It can be more acceptable for the complex facilities composed with many processes which require longer rails, because of simple rail structure. The test setup consists of a test vehicle and a rounded rail, in which the vehicle can load and unload products at arbitrary position commanded through wireless communications of host computer. The experimental results show that the suggested vehicle and rail have reasonable traction servo and robust electromagnetic suspensions without any contact. The resolution of point servo errors in the SLIM traction system is accomplished under 1mm. The maximum gap error is <TEX>${\pm}0.25mm$</TEX> with nominal air gap length of 4.0mm in the electromagnetic suspensions. This type of automated delivery vehicle is expected to have significant role in the clean delivery like FPD glass delivery.

Surface Treatment of Flat Panel Display Substrates by a Uniform Large Area Glow Cold Plasma Tunnel at Atmospheric Pressure

A novel, uniform, continuous, atmospheric pressure plasma tunnel (APPT), which was 400 ×175 ×2 mm3, had been developed for surface treatment of flat panel display (FPD) glass substrates in-line at atmospheric pressure with gas mixtures containing argon and oxygen. The electrical properties of the glow plasma tunnel were presented by simultaneous measurement of current and voltage and the results showed that there were a big phase shift and big different amplitudes of current waveforms, which were due to the variation of the capacitance between the discharge electrodes, when the FPD glass substrate passed through the tunnel. The effects of the plasma treatment on the surface of the FPD glass substrate had also been studied by using contact angle measurement and scanning probe microscopy (SPM). The results showed that the wettability of the surface had an obvious improvement after the plasma treatment with the time of 10 second.

Hybrid Laser Cutting for Flat Panel Display Glass

A new laser glass cutting technology using femtosecond and CO2 lasers is presented. Mechanical breaking after scribing using a femtosecond laser was evaluated and compared with the hybrid method for the cutting of flat panel display (FPD) glass. Various laser fluences were tested to determine the threshold energy and optimum grooving conditions without microcracks. The hybrid method was very effective for the FPD glass microfabrication and for performing full cutting without the mechanical breaking process. Consequently, it was found that the FPD panel was clearly cut using the method and the methodologies were very effective even for a mass-production cutting system.