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Discharge lamp and backlight unit for backlighting a display device comprising such a discharge lamp

A technology of discharge lamps and discharge tubes, which is applied to the parts of gas discharge lamps, discharge lamps, electrical components, etc., and can solve the problems of reducing effective lumen output, large energy, and surface overheating

Inactive Publication Date: 2008-09-17
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In known EEFLs, a conductive coating substantially covers the outside of the outer circumference of the discharge vessel, resulting in two non-luminous ends, thus reducing the effective lumen output
In addition, the use of conductive surface coatings on the ends results in large energy losses, which lead to overheating of the surfaces
These phenomena are the main disadvantages of the well-known EEFL

Method used

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  • Discharge lamp and backlight unit for backlighting a display device comprising such a discharge lamp
  • Discharge lamp and backlight unit for backlighting a display device comprising such a discharge lamp
  • Discharge lamp and backlight unit for backlighting a display device comprising such a discharge lamp

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Embodiment Construction

[0026] figure 1A side view showing part of a first embodiment of the fluorescent lamp of the present invention. The lamp 1 comprises an elongated substantially cylindrical discharge vessel made of glass and filled with an ionizable substance 3 such as a mixture of mercury and a noble gas. The discharge tube 2 is filled through an exhaust pipe 15 connected to the end surface of the discharge tube 2 . After filling the discharge vessel 2, the exhaust pipe 15 is sealed. At least two capacitive electrodes 4 (only one is shown in the figure) are connected to said tube 2, between which a discharge takes place during lamp operation along an axial distance. The axial direction is approximately parallel to the pipe wall 2 . The capacitive electrode 4 is adapted to capacitively couple HF electrical energy to said ionizable substance 3 . The capacitive electrode 4 is formed by a conductive layer 5 , such as metal, especially copper, so as to capacitively couple the tube wall 2 and th...

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Abstract

The invention relates to a discharge lamp (1), comprising: a light-transmissive discharge vessel (2) filled with an ionizable substance, and multiple electrodes (3, 4) connected to said vessel, between which electrodes a discharge extends during lamp operation, wherein at least one electrode is adapted for capacitive coupling of RF electrical energy to said ionizable substance. The invention also relates to a backlight module for backlighting a display device comprising at least one discharge lamp according to the invention. The invention further relates to a display device provided with at least one backlight module according to the invention.

Description

technical field [0001] The invention relates to a discharge lamp comprising a light-transmissive discharge vessel filled with an ionizable substance and at least two electrodes connected to said vessel, between which a discharge occurs during lamp operation along an axial distance, wherein, At least one electrode is adapted to capacitively couple HF electrical energy to said ionizable species. The invention also relates to a backlighting module for backlighting a display device, in particular an LCD unit, comprising at least one discharge lamp according to the invention. The invention also relates to a display device, in particular an LCD unit, having at least one backlighting module according to the invention. Background technique [0002] Hot cathode fluorescent tubes (HCFLs) are well known for providing backlighting for liquid crystal devices such as liquid crystal displays (LCDs), among other uses. Usually, a high-frequency voltage with a frequency in the range of 20 k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/32H01J65/04
CPCH01J65/046H01J61/30G02F1/1335
Inventor M·格拉齐亚代C·费斯勒伊斯W·赫勒布勒克斯H·M·布利克J·莫森
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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