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Method of driving a discharge lamp in a projection system, and driving unit

A technology of projection system and drive unit, applied in the field of projection system

Inactive Publication Date: 2012-06-06
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While lamp power and light output can be modulated relatively quickly with a ratio between lamp current and light of about 1, the achievable characteristics of current lamp drivers are not sufficient for applications requiring greater precision

Method used

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  • Method of driving a discharge lamp in a projection system, and driving unit
  • Method of driving a discharge lamp in a projection system, and driving unit
  • Method of driving a discharge lamp in a projection system, and driving unit

Examples

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Embodiment Construction

[0052] The dimensions of objects in the drawings are chosen for clarity and do not necessarily reflect actual relative dimensions.

[0053] figure 1 Shown is the basic structure of a projector system 10 utilizing time-sequential color reproduction in which different colors, namely red, green and blue, are reproduced one by one and thus perceived due to the reaction time of the eye different colors.

[0054] The light of the lamp 1 is thus focused in the reflector 4 onto the color wheel 5 with the color segments red r, green g and blue b. For clarity, only three sections r, g, b are shown. Current color wheels typically have six segments with the sequence red, green, blue, red, green, blue. The spokes SP or transition regions are between the sections r, g, b. The color wheel 5 is driven at a rate to produce a red image, a green image or a blue image. Then, the red, green or blue light generated according to the position of the color wheel 5 is focused by the collimator len...

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Abstract

The invention describes a method of driving a discharge lamp (1) in a projection system (10), wherein, in a feed-forward control process, system status data (SDL, SDF, SDV) comprising static information pertaining to the design of the projection system and / or dynamic information pertaining to the projection system and / or dynamic information pertaining to the lamp operation are obtained. Based on the system status data (SDL, SDF, SDV), a momentary target light waveshape (LWT, LWT') required by the projection system (10) and a waveshape correcting function are determined. Subsequently, the actual current (I) of the discharge lamp (1) is controlled regulated according to a momentary required waveshape (RW) which is determined based on the target light waveshape (LWT, LWT') and the waveshape correcting function. Moreover the invention describes an appropriate driving unit (11) for driving a discharge lamp (1) and a projection system (10), comprising such a driving unit (11).

Description

technical field [0001] The invention relates to a method of driving a discharge lamp in a projection system. The invention also relates to a suitable drive unit for driving a discharge lamp in a projection system and to a projection system comprising such a drive unit. Background technique [0002] Discharge lamps, in particular high-pressure discharge lamps, comprise a lamp envelope comprising a material that is resistant to high temperatures, such as quartz glass. Electrodes made of tungsten protrude into such lamp envelopes from opposite sides. Such lamp envelopes are also referred to as "arc tubes" in the following description and contain a filling which includes one or more noble gases and, in the case of mercury vapor discharge lamps, mainly mercury. By applying a high voltage across these electrodes, a photo arc is created between the tips of these electrodes, which can then be maintained with a lower voltage. For reasons of the optical properties of high-pressure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/36
CPCH05B41/36H04N5/74H04N9/31H05B41/288
Inventor C·德佩T·芒特斯
Owner KONINK PHILIPS ELECTRONICS NV