Method and circuit arrangement for operating a high-pressure gas discharge lamp

A high-pressure gas, discharge lamp technology, applied in color signal processing circuits, parts of color TVs, electric light sources, etc., can solve problems such as image brightness decline

Inactive Publication Date: 2014-07-23
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While it is possible to compensate for this effect by measuring the current level and calculating a correction, this will mean that as the lamp gets older, the image brightness decreases

Method used

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  • Method and circuit arrangement for operating a high-pressure gas discharge lamp
  • Method and circuit arrangement for operating a high-pressure gas discharge lamp
  • Method and circuit arrangement for operating a high-pressure gas discharge lamp

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Embodiment Construction

[0029] In the following it will be assumed that the lamp is operated with a basic square wave AC current. However, it is also possible to superimpose the current pulses on the direct lamp current, so that the principle according to the invention can also be applied in this case.

[0030] In a first embodiment of the invention, the first current pulse superimposed on the alternating lamp current before the polarity change has the same polarity as the phase or period to be changed. function of the current operating voltage (which may vary over the lifetime of the lamp) and / or the desired mode of operation), to correct the color and / or brightness properties of the image or to obtain a desired color temperature or optimum color balance or The way the image of particular brightness shifts over time in the color segment or (primary) color and possibly in the white segment. This is usually caused by a corresponding shift in the phase of the AC lamp current with respect to the sequen...

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Abstract

A description is given of a method and a circuit arrangement for operating a high-pressure gas discharge lamp with a lamp current superposed with first current pulses, in particular in a system for the time-sequential production of (primary) colors and possibly white segments, from which an image to be displayed is synthesized, in which, in order to change or correct color and / or brightness properties of the image, the first current pulses are adjusted with regard to their amplitude and / or temporal length and / or temporal position relative to the production of the colors and / or white segments. A description is also given of a projection system comprising such a circuit arrangement.

Description

technical field [0001] The invention relates to a method and a circuit arrangement for operating a high-pressure gas discharge lamp (HID lamp or UHP [Ultra High Performance] lamp) with a lamp current superimposed on a first current pulse, in particular for time-sequenced primary color and possible systems of the white segment, and is particularly used in projection displays that display original color images in lighting sequences, such as in DLP (Digital Light Processing) system or LCoS (Liquid Crystal on Silicon) system. The invention also relates to such a projection system comprising a high-pressure gas discharge lamp and such a circuit arrangement for displaying images or data. Background technique [0002] In projection systems, the light source used is usually one or more high pressure gas discharge lamps (HID lamps or UHP [Ultra High Performance] lamps). In principle, it is possible to operate the lamps with direct current as well as with alternating current. Howe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/392H04N9/73
CPCH04N9/3114H05B41/3928Y02B20/00
Inventor C·德佩H·蒙克
Owner KONINK PHILIPS ELECTRONICS NV
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