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High pressure discharge lamp lighting device and image display device

A technology for high-pressure discharge lamps and lighting devices, applied in the fields of high-pressure discharge lamp lighting devices and image display devices, which can solve problems such as increased costs and reduced degrees of freedom, and achieves reduced flickering, reduced time for electrode temperature drop, and easy power supply Effect

Inactive Publication Date: 2013-07-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In the method of inserting a lighting frequency lower than the normal lighting frequency for a predetermined period as in Patent Document 1 and Patent Document 2, it is necessary to determine the switching element on the high potential side as the drive circuit in accordance with the lighting frequency lower than the normal lighting frequency. The capacitance of the capacitor C3 for driving the power supply requires a capacitor with a larger capacitance than the case of designing with the normal lighting frequency, which causes cost increase.
In addition, although balanced with the capacitance of capacitor C3, the Figure 5 In the lamp current of the conventional example shown in (a), the lower limit value of the frequency lower than the normal lighting frequency is as follows: Figure 5 The dotted line in (c) can only be set so that the voltage of the capacitor C3 can ensure the threshold voltage Vth at which the switching element Q2 on the high potential side can be turned on, so the lower limit value of the frequency is set relatively low (in the figure The degrees of freedom of the time tmax) become smaller

Method used

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  • High pressure discharge lamp lighting device and image display device
  • High pressure discharge lamp lighting device and image display device
  • High pressure discharge lamp lighting device and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0057] In the high-pressure discharge lighting device of this embodiment, after the discharge lamp starts lighting, after reaching a substantially steady state or after reaching a predetermined lamp voltage, at each average power (electric power) input to the discharge lamp, as follows: figure 1 As shown, the discharge lamp is turned on in at least three lighting patterns.

[0058] It is characterized in that in "Mode 1" which is the first mode, the duty ratio (Duty ratio) of the lighting frequency is 50%, and in "Mode 2" which is the second mode, the duty ratio of the lighting frequency is 50%. It is a ratio of more than 50% (80% in the example), and in "mode 3" which is the third mode, the duty ratio of the lighting frequency is a ratio of less than 50% (20% in the example), and the mode 2 and the lighting frequencies f2 and f3 of the mode 3 are set to be equal to or less than the lighting frequency f1 of the mode 1, and the periods t1, t2, and t3 of each mode are at least ...

Embodiment approach 2

[0088] In the high-pressure discharge lighting device of the present embodiment, after the discharge lamp starts lighting, after reaching a substantially steady state, or after reaching a predetermined lamp voltage, at each average power input to the discharge lamp, as follows: figure 2 As shown, the discharge lamp is turned on in at least three lighting patterns. The circuit configuration may also be the same as that of the first embodiment.

[0089] In "mode 1" which is the first mode, the duty ratio of the lighting frequency is a ratio of 50%, and in "mode 2" which is the second mode, the duty ratio of the lighting frequency is a ratio of more than 50% (in 80% in the example), in "mode 3" which is the third mode, the duty ratio of the lighting frequency is less than 50% (20% in the example), and the lighting frequencies f2, At least one of f3 is higher than the lighting frequency f1 of mode 1, and the periods t1, t2, and t3 of each mode are at least one period or more, an...

Embodiment approach 3

[0106] The present embodiment is characterized in that, when changing the power supplied to the high-pressure discharge lamp, the lighting frequency is changed in at least one of the modes. The circuit configuration may be the same as that of the first embodiment.

[0107] The actions of this embodiment are, for example, Figure 11 like that. When changing the average power input to the high-pressure discharge lamp from power P1 to power P2, the lighting frequency in the first lighting pattern is changed from f1 to f1'. Moreover, when changing the average electric power input into a high pressure discharge lamp from electric power P2 to electric power P1, the lighting frequency of a 1st lighting pattern is changed from f1' to f1. exist Figure 11 In the example of , when power P1>power P2, frequency f1>frequency f1'.

[0108] In this example, the first lighting pattern is a period in which protrusions are formed on the electrodes, and the size of the protrusions is made to...

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Abstract

[Object] To provide a high pressure discharge lamp lighting device which can reduce flickering of a high-pressure discharge lamp with a relatively simple control. [Means for Settlement] Upon start of lighting of a high-pressure discharge lamp, after the high-pressure discharge lamp reaches a substantially stable state or reaches a predetermined lamp voltage, the high-pressure discharge lamp is lighted in at least three lighting modes with a predetermined average power put into the high-pressure discharge lamp, and in the lighting modes, a period of a positive polarity is nearly equal to a period of a negative polarity in a first mode, a period of a positive polarity is longer than a period of a negative polarity in a second mode, and a period of a positive polarity is shorter than a period of a negative polarity in a third mode. Lighting frequencies in the second mode and the third mode are equal to or less than a lighting frequency in the first mode, each of periods t1, t2, t3 in the modes is at least one cycle, at least one first mode, and at least one second mode and at least one third mode are collectively defined as one set and the one set is repeated.

Description

technical field [0001] The present invention relates to a high-pressure discharge lamp lighting device for lighting a high-intensity high-pressure discharge lamp (HID lamp) such as a high-pressure mercury lamp or a metal halide lamp, and an image display device using the same. Background technique [0002] In recent years, projection-type projectors using liquid crystal devices, or DLP (Texas Instruments registered trademark) projection-type projectors using DMD (Texas Instruments registered trademark), which is a reflective image display device, have been used in order to reduce the Flicker (flicker), as in JP-10-501919 and JP-2001-244088, by superimposing a pulse current on the lamp current, or as in JP-2004-281381 The method of deforming the lamp current waveform by superimposing a triangular wave on the lamp current reduces lamp flicker. [0003] In addition, in a projector of a projection method using a liquid crystal device, the liquid crystal device is changed from a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/24G03B21/20
CPCH05B41/38
Inventor 渡边浩士中野智之长谷川纯一中田克佳
Owner PANASONIC CORP