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Discharge lamp driving device, light source device, projector, and discharge lamp driving method

A technology for driving devices and discharge lamps, which is applied in the direction of electric light sources, projection devices, lamp circuit layout, etc., which can solve the problems of shape deformation, temperature drop, and flickering of the front end of electrodes, and achieve the effects of suppressing flicker and improving service life

Active Publication Date: 2017-03-22
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the above-mentioned method, there is a problem that the melting amount of the protrusion at the tip of the electrode on the anode side is increased by using a direct current, and on the other hand, the temperature of the electrode on the cathode side is lowered. Flicker occurs when the shape of the tip of the electrode on the cathode side is deformed

Method used

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  • Discharge lamp driving device, light source device, projector, and discharge lamp driving method
  • Discharge lamp driving device, light source device, projector, and discharge lamp driving method
  • Discharge lamp driving device, light source device, projector, and discharge lamp driving method

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no. 1 Embodiment approach ＞

[0057] Such as figure 1 As shown, the projector 500 of this embodiment includes: a light source device 200, a parallelizing lens 305, an illumination optical system 310, a color separation optical system 320, three liquid crystal light valves (light modulators) 330R, 330G, 330B, a cross point Chromatic prism 340 and projection optical system 350.

[0058] The light emitted from the light source device 200 enters the illumination optical system 310 through the parallelizing lens 305 . The parallelizing lens 305 parallelizes the light from the light source device 200 .

[0059] The illumination optical system 310 adjusts the illuminance of the light emitted from the light source device 200 to be uniform on the liquid crystal light valves 330R, 330G, and 330B. Furthermore, the illumination optical system 310 unifies the polarization direction of the light emitted from the light source device 200 into one direction. The reason for this is to effectively use the light emitted fr...

no. 2 Embodiment approach ＞

[0202] The second embodiment differs from the first embodiment in that direct current periods PDa and PDb are provided in the second period PH22. In addition, about the same structure as the above-mentioned embodiment, description may be abbreviate|omitted by attaching the same code|symbol suitably.

[0203] Figure 9 It is a figure which shows the drive current waveform of the drive current I supplied to the discharge lamp 90 in this embodiment. Figure 9 In , the vertical axis represents the driving current I, and the horizontal axis represents the time T. Such as Figure 9 As shown, the second period PH22 has a first frequency period Pf1, a second frequency period Pf2, and DC periods PDa and PDb.

[0204] The DC periods PDa and PDb are periods in which a DC current is supplied to the discharge lamp 90 . That is, during the DC periods PDa and PDb, the drive current I having either the first polarity or the second polarity is supplied to the discharge lamp 90 .

[0205] ...

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Abstract

The invention provides a discharge lamp driving device, a light source device, a projector, and a discharge lamp driving method. In an aspect of a discharge lamp driving device, the controller is configured to supply a driving current to a discharge lamp, the driving current alternately having a first period and a second period. The first period includes a plurality of consecutive first unit driving periods each of which is constituted of a first polarity period and a second polarity period. The second period includes a plurality of consecutive second unit driving periods. In the first unit driving period, a length of one polarity period is larger than the other polarity period, and a duration ratio which is a ratio of the length of the one polarity period to the length of the other polarity period is equal to or more than a predetermined value. In the second unit driving period, the duration ratio is equal to or more than 1, and is less than the predetermined value.

Description

technical field [0001] The present invention relates to a discharge lamp driving device, a light source device, a projector and a discharge lamp driving method. Background technique [0002] It is known that when the lamp voltage is lowered due to deterioration of the discharge lamp, it becomes difficult for the electrodes to melt, so that the protrusion at the tip of the electrode becomes thinner, and the deterioration of the discharge lamp accelerates. [0003] On the other hand, as shown in Patent Document 1, for example, a method of inserting a DC current between AC currents supplied to a discharge lamp and increasing the DC current component as the deterioration of the discharge lamp progresses is proposed. [0004] prior art literature [0005] Patent Document 1: Japanese Patent Laid-Open No. 2011-23288 Contents of the invention [0006] The problem to be solved by the invention [0007] However, in the above-mentioned method, there is a problem that the melting a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCH05B47/10G09G3/3406H05B41/2825G03B21/2053G03B21/2026
Inventor 寺岛彻生中込阳一
Owner SEIKO EPSON CORP