Illumination unit and liquid crystal display device

Details Illumination unit and liquid crystal display device Illumination unit and liquid crystal display device

1998-10-30

2000-07-25

Philogene, Haissa

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315246, 315257, 315344, 315DIG1, G05F 100

Patent

active

060940158

ABSTRACT:
An illumination unit comprises a high-frequency supply (1) and a low-pressure discharge lamp (2). The high-frequency supply (1) is provided with a first and a second output (13a, 13b). The outputs each deliver a HF-varying voltage with respect to ground. The voltages have the same magnitude and are in phase opposition. The supply (1) is provided with a further output (13c) which is substantially free of high-frequency voltage variations with respect to ground. The low-pressure discharge lamp (2) is provided with a tubular discharge vessel (20) with an ionizable filling. The discharge vessel comprises a first and a second external electrode (23a, 23b), which are arranged at opposite ends (24a, 24b, respectively) of the discharge vessel and which are connected to the first and the second output (13a, 13b) of the supply (1) and a further external electrode (23c) which is arranged centrally between the ends (24a, 24b) of the discharge vessel (20), said external electrode being connected to the further output (13c) of the supply (1). The measure results in a more uniform brightness distribution of the discharge vessel (20).

REFERENCES:
patent: 4748383 (1988-05-01), Houkes
patent: 4751434 (1988-06-01), Helling et al.
patent: 5041762 (1991-08-01), Hartai
patent: 5070273 (1991-12-01), Van den Bogert et al.
patent: 5089943 (1992-02-01), Wolfelschneider
patent: 5220249 (1993-06-01), Tsukada
patent: 5325024 (1994-06-01), Piejak et al.

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