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Method of driving a discharge lamp, driving arrangement, an projector system

A discharge lamp, driven technology, used in the field of projector systems, which can solve the problems of unsatisfactory viewing experience, overheating of the lamp wall, and drop in light output

Inactive Publication Date: 2009-08-12
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An undesirable side effect of this blackening is that returning the rated power to the lamp will cause the lamp wall to overheat due to the altered heat absorption properties, causing the quartz to recrystallize
The effect of this is that the quartz chamber takes on a "creamy" or "whitened" appearance, causing a significant drop in light output from the lamp
Finally, the lifetime of the lamp will be greatly shortened
On the other hand, the controlled increase in lamp power achieved with the prior art methods mentioned above to avoid blackout may result in a light output that is too bright for the film sequence being displayed, resulting in unsatisfactory viewing Experience and user dissatisfaction

Method used

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  • Method of driving a discharge lamp, driving arrangement, an projector system
  • Method of driving a discharge lamp, driving arrangement, an projector system
  • Method of driving a discharge lamp, driving arrangement, an projector system

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Embodiment Construction

[0035] The dimensions of objects in the drawings are chosen for clarity and do not necessarily reflect actual relative dimensions.

[0036] figure 1 The basic configuration of a projector system 10 is shown using time-sequential color rendering, where different colors in an image (red, green and blue) are rendered one by one, a process that is not perceptible to the user due to eye reaction time.

[0037] The light of the lamp 1 is focused in a reflector 11 onto a color wheel 12 with the color segments red r, green g and blue b. For clarity, only 3 segments r, g, b are shown. Today's color wheels typically have 6 segments in the sequence red, green, blue, red, green, blue, and some color wheels also include a white segment. Between the segments r, g, b there are spokes SP (or transition regions). The color wheel 12 is driven at a certain step such that a red image, a green image or a blue image is generated. The red, green or blue light generated according to the position ...

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PUM

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Abstract

The invention describes a method of driving a discharge lamp (1), wherein a blackening value (N) is determined, which blackening value (N) represents a level of blackening of the interior of the lamp (1), and a recovery parameter (2, T) is calculated based on the blackening value (N). When the lamp power is increased above the saturation power level, the lamp (1) is driven according to the recovery parameter (2, T) for the duration of a specific recovery time. The invention further describes a driving arrangement (70, 70'), and a projector system (10) comprising a high-pressure discharge lamp (1) and such a driving arrangement (70, 70').

Description

technical field [0001] The invention relates to a method of operating a discharge lamp. Furthermore, the invention relates to a suitable drive arrangement for driving a discharge lamp in a projector system, and also to a projector system comprising said drive arrangement. Background technique [0002] Gas discharge lamps, in particular high pressure gas discharge lamps, comprise an envelope or chamber made of a high temperature resistant material such as quartz glass. Electrodes made of tungsten protrude into the chamber from opposite sides. The chamber contains a filling consisting of one or more noble gases and, in the case of mercury vapor discharge lamps, mainly consisting of mercury. By applying an initial high voltage across the electrodes, a light arc is created between the tips of the electrodes, which can then be maintained at a low voltage during lamp operation. Due to their optical properties, high-pressure gas discharge lamps (also known as "lamp caps") are us...

Claims

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Application Information

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IPC IPC(8): H05B41/292
CPCH05B41/2928
Inventor T·芒特斯P·佩卡斯基C·德佩
Owner KONINKLIJKE PHILIPS ELECTRONICS NV