Mercury-Free Xe Flat Discharge Lamps for Lighting.

Shiga, Tomokazu; Ikeda, Y.; Mikoshiba, S.; Shinada, Shinichi

doi:10.2150/jlve.25.2_10

Cited by 15 publications

(11 citation statements)

References 1 publication

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“…This can be accomplished by narrowing the electrode width and also by adjusting the duty cycle of the drive voltage pulse to 50%. 5 In the low luminance region of Fig. 7, the efficacy of the Xe lamp increases with luminance.…”

Section: Environmental Issuementioning

confidence: 93%

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LCD backlights: with or without Hg?

Shiga

Mikoshiba

2002

J Soc Info Display

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High luminance and efficacy vs. temperature independence and environmental protection: these are the determining factors for the choice of Hg or Xe for LCD backlights. A capacity-coupled cylindrical Hg discharge lamp attains a luminance of 114,000 cd/m 2 and an efficacy of 35 lm/W when driven at 5 MHz. On the other hand, a mercury-free Xe flat discharge backlight produces 11,000 cd/m 2 and 30 lm/W, with fast luminance response. This paper discusses the underlying limitations assessed to the Hg and Xe backlights, considering application to LC TVs.

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Section: Environmental Issuementioning

confidence: 93%

“…The Xe flat discharge lamp can be made even larger so that the luminous flux becomes comparable to that of a commercially available FL15 (15-W Hg fluorescent lamp) for illumination. 5 Table 3 compares the characteristics of the Xe flat discharge lamp and the FL15. The luminance and luminous flux are almost the same.…”

Section: Environmental Issuementioning

confidence: 99%

LCD backlights: with or without Hg?

Shiga

Mikoshiba

2002

J Soc Info Display

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“…In order to simplify the structure and also to ensure long lifetime under severe conditions required for TV expression, a use of Hg flat discharge fluorescent lamps is suggested. Such lamps of small sizes have already been reported elsewhere [1]. An objective of this study is to enlarge the lamp area to 32 inches diagonal.…”

Section: Introductionmentioning

confidence: 93%

47.3: Lateral Multi‐Channel Flat Discharge Fluorescent Lamp for LC‐TV Backlight

Shiga

Mikoshiba

et al. 2004

Symp Digest of Tech Papers

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An experimental, 32‐in.‐diagonal Hg flat discharge fluorescent lamp was developed for an LC‐TV backlight. An electron density in the lamp is 1/20 and VUV phosphor load is 1/160 of the conventional EEFLs. With a proper lamp design, current density at the electrodes may be reduced to 1/3 of the EEFLs. These ensure longer lifetime and higher efficacy. The ignition voltage is relatively low at 700V.

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“…From Shiga and al. [17][18][19], the duty cycle is an important parameter on the efficacy and the consumed power. For a fixed pressure:…”

Section: Optimizations Studies: Efficacy Vs (Pressure Frequency Andmentioning

confidence: 99%

Parametric Studies of a Mercury-Free DBD Lamp

Caillier

Therese

Belenguer

et al. 2021

Plasma

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Mercury discharge lamps are often used because of their high efficiency; however, the usage of mercury lamps will be restricted or forbidden for safety and environmental purposes. Finding alternative solutions to suppress mercury is of major interest. The aim of this work is to increase the luminous efficacy of a commercial-free mercury flat dielectric barrier discharge lamp (Planilum, St Gobain) in order to reach the necessary conditions for the lamp to be used as a daily lighting source. The lamp is made of two glass plates separated by a gap of 2 mm. The gap is filled by a neon xenon mixture. The external electrodes made of transparent ITO (indium tin oxide) are deposited on the lamp glass plates. The electrical signal applied to the electrodes generates a UV-emitting plasma inside the gap. Phosphors deposited on the glass allow the production of visible light. The original electrode geometry is plane-to-plane; this induces filamentary discharges. We show that changing the plane-to-plane geometry to a coplanar geometry allows the plasma to spread all over the electrode surface, and we can reach twice the efficacy of the lamp (32 lm/W) as compared to the original value. Using this new electrode geometrical configuration and changing the electrical signal from sinusoidal to a pulsed signal greatly improves the visual uniformity of the emitted light all over the lamp. Electrical and optical parametric measurements were performed to study the lamp characteristics. We show that it is possible to develop a free mercury lamp with an efficacy compatible with lighting purposes.

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Mercury-Free Xe Flat Discharge Lamps for Lighting.

Cited by 15 publications

References 1 publication

LCD backlights: with or without Hg?

LCD backlights: with or without Hg?

47.3: Lateral Multi‐Channel Flat Discharge Fluorescent Lamp for LC‐TV Backlight

Parametric Studies of a Mercury-Free DBD Lamp

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