A 100,000‐cd/m 2  capacity‐coupled electrodeless discharge backlight with high efficacy for LC TVs | Zendy

Baba Y. | Zendy; Izuka M. | Zendy; Shiga T. | Zendy; Mikoshiba S. | Zendy; Nishiyama S. | Zendy

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A 100,000‐cd/m 2 capacity‐coupled electrodeless discharge backlight with high efficacy for LC TVs

Author(s) -

Baba Y.,

Izuka M.,

Shiga T.,

Mikoshiba S.,

Nishiyama S.

Publication year - 2002

Publication title -

journal of the society for information display

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.578

H-Index - 52

eISSN - 1938-3657

pISSN - 1071-0922

DOI - 10.1889/1.1827861

Subject(s) - backlight , gas discharge lamp , luminous efficacy , materials science , luminance , ballast , optoelectronics , voltage , phase (matter) , electrical impedance , optics , physics , electrical engineering , liquid crystal display , layer (electronics) , quantum mechanics , composite material , engineering

— A capacity‐coupled electrodeless Hg discharge lamp has been developed for LC TV backlightings. By applying sinusoidal voltages which are 180° out of phase with a pair of external electrodes, a luminous uniformity of over 84% is attained in two types of lamps whose lengths are 190 and 390 mm. Luminance, efficacy, and input power to the lamp are 114,000 cd/m 2 , 35 lm/W, and 21.5 W when the 390‐mm lamp is driven at 5 MHz. With a frequency below 1.1 MHz, eight 390‐mm lamps, connected in parallel to one another without external ballast impedance, can be driven by using a single inverter.

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